i say green.
it's not really a fair comparison with those images, because the blue all matches, and the green has blue scirra lettering, and also the minty background is very blueish, while the blue theme is completely cohesive, here's a comparison on more even footing:(maybe the background should be grey, on the green, too?)
I do think blue looks more professional. but I don't think it needs to look more professional. scirra is not going to appeal to larger corporations until down the line. scirra needs to be cool, fun, and powerful. not cold, corporate, and calculated
[QUOTE=Ashley] I like lucid's all-green theme better than the all-blue one. Right now the site is mainly green, but with bits of blue. That's my main worry about the blue one - it's good, but it does look very corporate and serious. The blue one seems very "technical documentation for Microsoft Office", whereas green is more fun and lively. I'm still being outvoted though :)[/QUOTE]
maybe we can get the alternate green on the OP?