Themes in GMail!

So far, to spice up the GMail, I had to use the BetterGmail extension in firefox. But now, GMail has started rolling out a new feature which will enable to choose a theme that already exists and also create our own custom theme! Sounds fantastic. Also, GMail blog mentions that they have tweaked the default theme a little bit to make it look even better, though I couldn't notice that!

Anyway, which one do you like the most?