I plan on creating logos for you the designer and your design forums soon ( the current ones being temporary place holders) and I was thinking about fav icons which are the little bookmarking 16x16 symbols for websites.
As you learn about logo design they teach you that a logo should be able to reproduce well at small and large sizes and I think the fav icon is the ultimate small size test. If your logo has a symbol test it at 16x16 pixels to see if it holds up well!
The SIRIUS dog logo is a pretty good example:
http://www.sirius.com/