[Proposal] Powered by XWiki logo

Hi, I think it's high time we get a powered by XWiki logo! :) Laurent Lunati has created 5 variations attached. Does anyone have any feedback in term of size, color, look, etc? The idea is that once we get an agreement on the logo we publish it on xwiki.org and we ask that people using XWiki display this badge on their web site if they want to be good open source citizens :) (and thus we'll also use it on xwiki.org itself). My preference goes to the 80X15.png logo. What about you? Thanks -Vincent