I ordered predominately browns and grays to start with. Typical rock colors. Maybe someday I'll move on to different subject matter where I can use blues and greens and colors other than gray and brown.
I have been thinking about minerals that come in more interesting colors (come on, who wants to enamel in brown all the time?) I'm rapidly becoming obsessed with garnet reds and olivine greens. I'm thinking about doing some forms in aquamarine blue and amethyst purple, and maybe something really crazy and orange/yellow like realgar, or orpiment. You know, something full of arsenic.