Corel PSP has had a Materials Propery Dialog that presents you with the various options of using Mono, Complementary, Triad, Tetrad, Analogic, Accented choices. I think Photoshop has something similar (where else would Corel get this idea) . I think it would make a very nice, and very useful feature to APhoto. Since there's always numerous requests to add features to APhoto that come from Photoshop, why not add something from PSP?