Papa John's Pizza logo.

Two different Domino's Pizza logos.

1)Dreamcast logo for light-colored backgrounds
2)Dreamcast logo for dark-colored backgrounds.

This logo used to stand for a lot more than it does now...

Simple Ubisoft logo.

1)Best on light-colored backgrounds.
2)Good for dark-colored backgrounds.

Simple yelp.com logo
1)For dark backgrounds.
2)For any background.

Some logos for The Photo Forum:

The links in this comment no longer work--

Ok, we have transparent logos, so why not have a transparent background? Well here I will show you how to do it.

Before you get too exited, I'm going to tell you right now that this isn't perfect. It only looks transparent if you don't have any windows under firefox, and if the top right corner of your firefox window isn't in the top right corner of your screen, the "illusion" won't work. If you think up of a better way of doing it, tell me =].