Yeah I second this notion, but for all languages. BUT, I don't necessarily need to pick them all out, if you let me pick colors for what you already have shown, thats enough in my book, as long as you have some kind of syntax highlighting where my same sort of general color scheme/theme permeates through all (or most) languages.
You may actually already do this, I haven't actually picked all my colors, downloaded it, and given it a try yet...
Yeah, it already does that. I just had a few different languages shown in the preview. I initially wanted to allow users to pick sample code from different languages to show up in the preview box, but ran out of time for the contest.
Vim handles the color and style of text by looking at what scope it's classified under, and then following rules that match that scope. I found this video to be really helpful when learning how things worked: http://vimcasts.org/episodes/creating-colorschemes-for-vim/
You may actually already do this, I haven't actually picked all my colors, downloaded it, and given it a try yet...