>> * Use in widget styles.  But perhaps this should be in KStyle then.
>
> I think there's /just/ enough users outside of styles to make this not
> the most optimal solution :-).

I won't accept this stuff in KStyle anyway. KStyle has a specific
function: to simplify interfacing to QStyle, and do the annoying layout
work for that. Messing with colors isn't part of that functionality, so
IMHO belongs in a different class.