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:4]
[BLACK_G:32]
[BLACK_B:41]
[BLUE_R:33]
[BLUE_G:118]
[BLUE_B:199]
[GREEN_R:115]
[GREEN_G:138]
[GREEN_B:5]
[CYAN_R:37]
[CYAN_G:146]
[CYAN_B:134]
[RED_R:209]
[RED_G:28]
[RED_B:36]
[MAGENTA_R:198]
[MAGENTA_G:28]
[MAGENTA_B:111]
[BROWN_R:165]
[BROWN_G:119]
[BROWN_B:6]
[LGRAY_R:129]
[LGRAY_G:144]
[LGRAY_B:144]
[DGRAY_R:71]
[DGRAY_G:91]
[DGRAY_B:98]
[LBLUE_R:42]
[LBLUE_G:151]
[LBLUE_B:255]
[LGREEN_R:169]
[LGREEN_G:203]
[LGREEN_B:8]
[LCYAN_R:50]
[LCYAN_G:193]
[LCYAN_B:178]
[LRED_R:255]
[LRED_G:34]
[LRED_B:44]
[LMAGENTA_R:255]
[LMAGENTA_G:35]
[LMAGENTA_B:143]
[YELLOW_R:255]
[YELLOW_G:184]
[YELLOW_B:9]
[WHITE_R:252]
[WHITE_G:244]
[WHITE_B:220]