I've found some DIGIC values that control tint of the live view screen, controls the text colors and also the box messages.
C0F14800 [ ] [N] Tints live view in nice colors.
C0F14804 [ ] [N] Changes screen text color (but not shutter/aperture colors if in 5x zoom)
C0F14808 [ ] [N] Changes colors of the text screen bar (ie where digic poke values are shown)
C0F1480C [ ] [N] Changes colors of the little x5 zoom icon and the bottom shutter/aperture exposure field
C0F14810 [ ] [N] Changes colors of shutter/aperture when in for example 5x zoom mode
Would be nice to add this also in the Color schemes and even tinting the live view screen could come to use. ie. tinting the screen is a darker blue, if the theme was blue or whatever...
It seems most color-combinations are selectable...