Where can I get themes and eye-candy for my desktop?

Web Upd8 is where I got a lot of nice themes and tips for customization. Plus they maintain a PPA with modding/utility apps.They also have a PPA ppa:webupd8team/themes (How to add PPAs) specifically for themes.

Here you'll find some Ubuntu related art: http://browse.deviantart.com/?q=gallery%3Aubuntu-artists%2F24290476

And here, Ubuntu awareness material (and release countdown buttons) : http://spreadubuntu.neomenlo.org/

Regards!

Here are some themes PPAs:

• https://launchpad.net/~tiheum/+archive/equinox
• https://launchpad.net/~elementaryart/+archive/ppa
• https://launchpad.net/~elegant-gnome/+archive/ppa

All of those are amazing themes. The first PPA comes with the updated Ubuntu Light Themes backported from Ubuntu 10.10 to Ubuntu 10.04.