Xterm defaults to black text, the foreground color, on a white background. The foreground and background colors can be reversed using the VT Options menu or with the
-rv command line option.
$ xterm -rv
/usr/share/vim/vim73/rgb.txtto view the list of color names with their decimal RGB values.
Colors may also be specified using hexadecimal RGB values, with the format
rgb:RR/GG/BB, or the older and not encouraged syntax
#RRGGBB. The color
PapayaWhip is the same as
rgb:ff/ef/d5, which is the same as
Xterm's foreground color, meaning the default text color, and the background color may be set from the command line, using the options
xterm -fg PapayaWhip -bg "rgb:00/00/80"