There are 101 shades of gray in R. Along with lightgray, lightslategray, slategray, darkgray, darkslategray. Way more shades of gray than I will ever use. I think I will try lavenderblush4 and chocolate4

colors()

[1] “white” “aliceblue” “antiquewhite” “antiquewhite1″

[5] “antiquewhite2″ “antiquewhite3″ “antiquewhite4″ “aquamarine”

[9] “aquamarine1″ “aquamarine2″ “aquamarine3″ “aquamarine4″

[13] “azure” “azure1″ “azure2″ “azure3″

[17] “azure4″ “beige” “bisque” “bisque1″

[21] “bisque2″ “bisque3″ “bisque4″ “black”

[25] “blanchedalmond” “blue” “blue1″ “blue2″

[29] “blue3″ “blue4″ “blueviolet” “brown”

[33] “brown1″ “brown2″ “brown3″ “brown4″

[37] “burlywood” “burlywood1″ “burlywood2″ “burlywood3″

[41] “burlywood4″ “cadetblue” “cadetblue1″ “cadetblue2″

[45] “cadetblue3″ “cadetblue4″ “chartreuse” “chartreuse1″

[49] “chartreuse2″ “chartreuse3″ “chartreuse4″ “chocolate”

[53] “chocolate1″ “chocolate2″ “chocolate3″ “chocolate4″

[57] “coral” “coral1″ “coral2″ “coral3″

[61] “coral4″ “cornflowerblue” “cornsilk” “cornsilk1″

[65] “cornsilk2″ “cornsilk3″ “cornsilk4″ “cyan”

[69] “cyan1″ “cyan2″ “cyan3″ “cyan4″

[73] “darkblue” “darkcyan” “darkgoldenrod” “darkgoldenrod1″

[77] “darkgoldenrod2″ “darkgoldenrod3″ “darkgoldenrod4″ “darkgray”

[81] “darkgreen” “darkgrey” “darkkhaki” “darkmagenta”

[85] “darkolivegreen” “darkolivegreen1″ “darkolivegreen2″ “darkolivegreen3″

[89] “darkolivegreen4″ “darkorange” “darkorange1″ “darkorange2″

[93] “darkorange3″ “darkorange4″ “darkorchid” “darkorchid1″

[97] “darkorchid2″ “darkorchid3″ “darkorchid4″ “darkred”

[101] “darksalmon” “darkseagreen” “darkseagreen1″ “darkseagreen2″

[105] “darkseagreen3″ “darkseagreen4″ “darkslateblue” “darkslategray”

[109] “darkslategray1″ “darkslategray2″ “darkslategray3″ “darkslategray4″

[113] “darkslategrey” “darkturquoise” “darkviolet” “deeppink”

[117] “deeppink1″ “deeppink2″ “deeppink3″ “deeppink4″

[121] “deepskyblue” “deepskyblue1″ “deepskyblue2″ “deepskyblue3″

[125] “deepskyblue4″ “dimgray” “dimgrey” “dodgerblue”

[129] “dodgerblue1″ “dodgerblue2″ “dodgerblue3″ “dodgerblue4″

[133] “firebrick” “firebrick1″ “firebrick2″ “firebrick3″

[137] “firebrick4″ “floralwhite” “forestgreen” “gainsboro”

[141] “ghostwhite” “gold” “gold1″ “gold2″

[145] “gold3″ “gold4″ “goldenrod” “goldenrod1″

[149] “goldenrod2″ “goldenrod3″ “goldenrod4″ “gray”

[153] “gray0″ “gray1″ “gray2″ “gray3″

[157] “gray4″ “gray5″ “gray6″ “gray7″

[161] “gray8″ “gray9″ “gray10″ “gray11″

[165] “gray12″ “gray13″ “gray14″ “gray15″

[169] “gray16″ “gray17″ “gray18″ “gray19″

[173] “gray20″ “gray21″ “gray22″ “gray23″

[177] “gray24″ “gray25″ “gray26″ “gray27″

[181] “gray28″ “gray29″ “gray30″ “gray31″

[185] “gray32″ “gray33″ “gray34″ “gray35″

[189] “gray36″ “gray37″ “gray38″ “gray39″

[193] “gray40″ “gray41″ “gray42″ “gray43″

[197] “gray44″ “gray45″ “gray46″ “gray47″

[201] “gray48″ “gray49″ “gray50″ “gray51″

[205] “gray52″ “gray53″ “gray54″ “gray55″

[209] “gray56″ “gray57″ “gray58″ “gray59″

[213] “gray60″ “gray61″ “gray62″ “gray63″

[217] “gray64″ “gray65″ “gray66″ “gray67″

[221] “gray68″ “gray69″ “gray70″ “gray71″

[225] “gray72″ “gray73″ “gray74″ “gray75″

[229] “gray76″ “gray77″ “gray78″ “gray79″

[233] “gray80″ “gray81″ “gray82″ “gray83″

[237] “gray84″ “gray85″ “gray86″ “gray87″

[241] “gray88″ “gray89″ “gray90″ “gray91″

[245] “gray92″ “gray93″ “gray94″ “gray95″

[249] “gray96″ “gray97″ “gray98″ “gray99″

[253] “gray100″ “green” “green1″ “green2″

[257] “green3″ “green4″ “greenyellow” “grey”

[261] “grey0″ “grey1″ “grey2″ “grey3″

[265] “grey4″ “grey5″ “grey6″ “grey7″

[269] “grey8″ “grey9″ “grey10″ “grey11″

[273] “grey12″ “grey13″ “grey14″ “grey15″

[277] “grey16″ “grey17″ “grey18″ “grey19″

[281] “grey20″ “grey21″ “grey22″ “grey23″

[285] “grey24″ “grey25″ “grey26″ “grey27″

[289] “grey28″ “grey29″ “grey30″ “grey31″

[293] “grey32″ “grey33″ “grey34″ “grey35″

[297] “grey36″ “grey37″ “grey38″ “grey39″

[301] “grey40″ “grey41″ “grey42″ “grey43″

[305] “grey44″ “grey45″ “grey46″ “grey47″

[309] “grey48″ “grey49″ “grey50″ “grey51″

[313] “grey52″ “grey53″ “grey54″ “grey55″

[317] “grey56″ “grey57″ “grey58″ “grey59″

[321] “grey60″ “grey61″ “grey62″ “grey63″

[325] “grey64″ “grey65″ “grey66″ “grey67″

[329] “grey68″ “grey69″ “grey70″ “grey71″

[333] “grey72″ “grey73″ “grey74″ “grey75″

[337] “grey76″ “grey77″ “grey78″ “grey79″

[341] “grey80″ “grey81″ “grey82″ “grey83″

[345] “grey84″ “grey85″ “grey86″ “grey87″

[349] “grey88″ “grey89″ “grey90″ “grey91″

[353] “grey92″ “grey93″ “grey94″ “grey95″

[357] “grey96″ “grey97″ “grey98″ “grey99″

[361] “grey100″ “honeydew” “honeydew1″ “honeydew2″

[365] “honeydew3″ “honeydew4″ “hotpink” “hotpink1″

[369] “hotpink2″ “hotpink3″ “hotpink4″ “indianred”

[373] “indianred1″ “indianred2″ “indianred3″ “indianred4″

[377] “ivory” “ivory1″ “ivory2″ “ivory3″

[381] “ivory4″ “khaki” “khaki1″ “khaki2″

[385] “khaki3″ “khaki4″ “lavender” “lavenderblush”

[389] “lavenderblush1″ “lavenderblush2″ “lavenderblush3″ “lavenderblush4″

[393] “lawngreen” “lemonchiffon” “lemonchiffon1″ “lemonchiffon2″

[397] “lemonchiffon3″ “lemonchiffon4″ “lightblue” “lightblue1″

[401] “lightblue2″ “lightblue3″ “lightblue4″ “lightcoral”

[405] “lightcyan” “lightcyan1″ “lightcyan2″ “lightcyan3″

[409] “lightcyan4″ “lightgoldenrod” “lightgoldenrod1″ “lightgoldenrod2″

[413] “lightgoldenrod3″ “lightgoldenrod4″ “lightgoldenrodyellow” “lightgray”

[417] “lightgreen” “lightgrey” “lightpink” “lightpink1″

[421] “lightpink2″ “lightpink3″ “lightpink4″ “lightsalmon”

[425] “lightsalmon1″ “lightsalmon2″ “lightsalmon3″ “lightsalmon4″

[429] “lightseagreen” “lightskyblue” “lightskyblue1″ “lightskyblue2″

[433] “lightskyblue3″ “lightskyblue4″ “lightslateblue” “lightslategray”

[437] “lightslategrey” “lightsteelblue” “lightsteelblue1″ “lightsteelblue2″

[441] “lightsteelblue3″ “lightsteelblue4″ “lightyellow” “lightyellow1″

[445] “lightyellow2″ “lightyellow3″ “lightyellow4″ “limegreen”

[449] “linen” “magenta” “magenta1″ “magenta2″

[453] “magenta3″ “magenta4″ “maroon” “maroon1″

[457] “maroon2″ “maroon3″ “maroon4″ “mediumaquamarine”

[461] “mediumblue” “mediumorchid” “mediumorchid1″ “mediumorchid2″

[465] “mediumorchid3″ “mediumorchid4″ “mediumpurple” “mediumpurple1″

[469] “mediumpurple2″ “mediumpurple3″ “mediumpurple4″ “mediumseagreen”

[473] “mediumslateblue” “mediumspringgreen” “mediumturquoise” “mediumvioletred”

[477] “midnightblue” “mintcream” “mistyrose” “mistyrose1″

[481] “mistyrose2″ “mistyrose3″ “mistyrose4″ “moccasin”

[485] “navajowhite” “navajowhite1″ “navajowhite2″ “navajowhite3″

[489] “navajowhite4″ “navy” “navyblue” “oldlace”

[493] “olivedrab” “olivedrab1″ “olivedrab2″ “olivedrab3″

[497] “olivedrab4″ “orange” “orange1″ “orange2″

[501] “orange3″ “orange4″ “orangered” “orangered1″

[505] “orangered2″ “orangered3″ “orangered4″ “orchid”

[509] “orchid1″ “orchid2″ “orchid3″ “orchid4″

[513] “palegoldenrod” “palegreen” “palegreen1″ “palegreen2″

[517] “palegreen3″ “palegreen4″ “paleturquoise” “paleturquoise1″

[521] “paleturquoise2″ “paleturquoise3″ “paleturquoise4″ “palevioletred”

[525] “palevioletred1″ “palevioletred2″ “palevioletred3″ “palevioletred4″

[529] “papayawhip” “peachpuff” “peachpuff1″ “peachpuff2″

[533] “peachpuff3″ “peachpuff4″ “peru” “pink”

[537] “pink1″ “pink2″ “pink3″ “pink4″

[541] “plum” “plum1″ “plum2″ “plum3″

[545] “plum4″ “powderblue” “purple” “purple1″

[549] “purple2″ “purple3″ “purple4″ “red”

[553] “red1″ “red2″ “red3″ “red4″

[557] “rosybrown” “rosybrown1″ “rosybrown2″ “rosybrown3″

[561] “rosybrown4″ “royalblue” “royalblue1″ “royalblue2″

[565] “royalblue3″ “royalblue4″ “saddlebrown” “salmon”

[569] “salmon1″ “salmon2″ “salmon3″ “salmon4″

[573] “sandybrown” “seagreen” “seagreen1″ “seagreen2″

[577] “seagreen3″ “seagreen4″ “seashell” “seashell1″

[581] “seashell2″ “seashell3″ “seashell4″ “sienna”

[585] “sienna1″ “sienna2″ “sienna3″ “sienna4″

[589] “skyblue” “skyblue1″ “skyblue2″ “skyblue3″

[593] “skyblue4″ “slateblue” “slateblue1″ “slateblue2″

[597] “slateblue3″ “slateblue4″ “slategray” “slategray1″

[601] “slategray2″ “slategray3″ “slategray4″ “slategrey”

[605] “snow” “snow1″ “snow2″ “snow3″

[609] “snow4″ “springgreen” “springgreen1″ “springgreen2″

[613] “springgreen3″ “springgreen4″ “steelblue” “steelblue1″

[617] “steelblue2″ “steelblue3″ “steelblue4″ “tan”

[621] “tan1″ “tan2″ “tan3″ “tan4″

[625] “thistle” “thistle1″ “thistle2″ “thistle3″

[629] “thistle4″ “tomato” “tomato1″ “tomato2″

[633] “tomato3″ “tomato4″ “turquoise” “turquoise1″

[637] “turquoise2″ “turquoise3″ “turquoise4″ “violet”

[641] “violetred” “violetred1″ “violetred2″ “violetred3″

[645] “violetred4″ “wheat” “wheat1″ “wheat2″

[649] “wheat3″ “wheat4″ “whitesmoke” “yellow”

[653] “yellow1″ “yellow2″ “yellow3″ “yellow4″

[657] “yellowgreen”