Hi,
I started working on merging geany-themes project into the Geany tree, as well as a few "fixups" to the Colorschemes menu, some of which are same as patches sent to the mailing list some time ago. Mostly left is cleaning up themes that cause warnings on geany verbose output and to test the themes with more lexers.
If you want to see the progress and/or test it out, the branch is here: https://github.com/codebrainz/geany/tree/colorscheme_fixup
Cheers, Matthew Brush