If you are a Google Chrome user, you should know this Themes Gallery for Google Chrome. I just discovered it yesterday and tried it. It has 2 categories ~ Themes by Artists and Themes by Google.

Google Chrome Theme

Actually, Mozilla Firefox also have theme gallery. But I just did not try it only. Google did a good job on attracting me to test it. It shows something on bottom right of the browser. Make you want to click to find out. Da… Da… I was caught.