Most people spend a lot of time looking at their email inbox, so why not make it look exactly how you want it to? That's what you can do now thanks to Gmail's new create your own theme option.
You can now select your own background image and change the colors of pretty much everything to whatever you want. And as MySpace taught us, giving people full customization is a one-way ticket to uglytown. Luckily, the ugliness created here will only be visible to those who create it. I'll keep mine nice and simple, thanks.