i was wondering, if it was possible to offer the file icons in different colors each. for example i like the grey/silber of the .ape icon. unfortunately i don't use monkey's audio but wavpack, so it would be kinda nice to use the color for my .wv files. so everyone could use his/her favorite colors for his/her favorite audio codecs

Simply rename the .ico files in the foobar2000 icons-directory to your needs.

that would work, if the icons didn't contain any text like "ogg", "ape", "mp3" etc....

Oh yes, I've missed that part

I always use the small version of the icons in Explorer's Details view, which have no text on them.

so there's no way to convince the guy who made these icons to do them in different colors ? too bad :/

You could use an icon editor to simply cut-and-paste the text from one icon into the other. It should be pretty easy to do.