Tired of your icons looking  lame? When you create a new entity, you can associate a new icon with it. Well, it has been amazing to me to see the number of people who leave the default one there. In building a demo system over the weekend, I found some pretty cool ones you can use for free. Check them out and stop making your system look “default.”
Enjoy!

I like the silk ones from this series: http://www.famfamfam.com/lab/icons/

 
These are interesting.
http://ndesign-studio.com/resources/pixel_icons.htm

Some interesting samples: http://www.icongalore.com/sales/purchase-and-download.php

Great Variety of them are also available here: http://www.iconarchive.com/

Some of the licenses vary and some cost money, some are free, some are for non commercial work only, etc… So be sure to read the licenses…