GNOME Colorscheme is a color scheme builder for the GNOME desktop. It is
useful for web creation as well as room painting. It supports 6 various types
of color schemes: Complements, Split Complements, Triads, Tetrads, Analogous,
and Monochromatic.

The user can lighten/darken the whole colorscheme or increase/decrease its
saturation.

WWW: http://home.gna.org/colorscheme/