I've got mine set to CJPC's style - love it!
As for the speech bubble not being completely uniform, I say leave it the way it is. You've already done so much to the site (all great improvements btw!) that something so small like that is negligible in comparison.
I like the idea of the Poll and in future (or leading upto the poll?) a self-service style-maker. You enter 3 or more hex colour codes relating to various parts or aspects of the page (i.e. Text, Title Bar, Navbar, etc) and create you're own style.
Kinda like this: colorizeit.com/styles/vbulletin-38-styles/48.caevo.html