We've got dark blue/purple, we've got green, pink, and white. So where's the red? We could use a nice dark, subdued red theme.
Of course, if there was a way to just replace textures and colors on an old theme, I could do it myself. I don't know any kind of code or script outside of GML, but I know how to replace stuff like that, and I think I could pick it up PRETTY quickly if I stare at it long enough.