These are the display colors in RGB.  The game is actually displaying extended ASCII characters in OpenGL, so you can modify the colors.

[BLACK_R:30]
[BLACK_G:20]
[BLACK_B:10]
[BLUE_R:20]
[BLUE_G:85]
[BLUE_B:200]
[GREEN_R:30]
[GREEN_G:100]
[GREEN_B:40]
[CYAN_R:81]
[CYAN_G:119]
[CYAN_B:113]
[RED_R:118]
[RED_G:22]
[RED_B:22]
[MAGENTA_R:133]
[MAGENTA_G:16]
[MAGENTA_B:171]
[BROWN_R:101]
[BROWN_G:62]
[BROWN_B:39]
[LGRAY_R:102]
[LGRAY_G:107]
[LGRAY_B:83]
[DGRAY_R:81]
[DGRAY_G:75]
[DGRAY_B:59]
[LBLUE_R:0]
[LBLUE_G:120]
[LBLUE_B:255]
[LGREEN_R:137]
[LGREEN_G:200]
[LGREEN_B:0]
[LCYAN_R:60]
[LCYAN_G:180]
[LCYAN_B:122]
[LRED_R:178]
[LRED_G:37]
[LRED_B:22]
[LMAGENTA_R:170]
[LMAGENTA_G:70]
[LMAGENTA_B:230]
[YELLOW_R:251]
[YELLOW_G:163]
[YELLOW_B:9]
[WHITE_R:220]
[WHITE_G:220]
[WHITE_B:220]