You can now choose different themes to apply to your gmail account. Just log in, go to settings, click the "themes" tab and select which theme you want. If you use gmail, what theme are you using? I'm currently using the "Beach" theme.
I'm switching between "Marina" and "Phantasea". I like blue - like, on the internet, and some other places outside of it, I have a thing for bright blue ... hell, my LPA MB theme is the blue one as well.
I have the ninja theme. Which looks like the normal theme until it sneaks up behind you and breaks your neck.