As a follow-up to my previous post:
I've created a logo based in the outline of a Compiz-Beryl cube. It should work as a meta-logo to combine it with the logos from several popular Free-Open Source Software projects. This could help create a common brand identity for such diverse ecosystem.
See the result:
And see how it combines with some other logos.
I've published the .svg source under the Creative Commons attribution, share-alike license.