Night Fortress: the davies.at palette as a Dwarf Fortress colour scheme.
Classic versions: replace data/init/colors.txt. Steam versions (v50+): save as prefs/colors.txt.
Everything outside square brackets is a comment.

[BLACK_R:20]
[BLACK_G:13]
[BLACK_B:26]
[BLUE_R:51]
[BLUE_G:64]
[BLUE_B:90]
[GREEN_R:36]
[GREEN_G:74]
[GREEN_B:60]
[CYAN_R:63]
[CYAN_G:127]
[CYAN_B:120]
[RED_R:107]
[RED_G:35]
[RED_B:53]
[MAGENTA_R:78]
[MAGENTA_G:41]
[MAGENTA_B:132]
[BROWN_R:160]
[BROWN_G:129]
[BROWN_B:100]
[LGRAY_R:198]
[LGRAY_G:217]
[LGRAY_B:204]
[DGRAY_R:149]
[DGRAY_G:140]
[DGRAY_B:168]
[LBLUE_R:143]
[LBLUE_G:168]
[LBLUE_B:216]
[LGREEN_R:122]
[LGREEN_G:224]
[LGREEN_B:176]
[LCYAN_R:134]
[LCYAN_G:201]
[LCYAN_B:190]
[LRED_R:232]
[LRED_G:128]
[LRED_B:110]
[LMAGENTA_R:185]
[LMAGENTA_G:160]
[LMAGENTA_B:230]
[YELLOW_R:232]
[YELLOW_G:176]
[YELLOW_B:98]
[WHITE_R:242]
[WHITE_G:235]
[WHITE_B:218]