Xresources

The ansi colors page might be of interest.

Below is the entire contents of my '~/.Xresources' file:

! Xterm stuff
XTerm*background:       black
XTerm*foreground:       white
XTerm*cursorColor:      #ff00af
XTerm*scrollBar:        false
XTerm*saveLines:        200000
XTerm*vt100.geometry:   120x40
 
! this makes menuconfig (etc) readable
XTerm*color11:          #d78700

Or for a 1920x1080 'ready' terminal, use:

XTerm*vt100.geometry:   280x70

Or for a side-by-side ready terminal use:

XTerm*vt100.geometry:   140x70