A set of graphics/icons for bags, backpacks and purses. Even includes instructions on how to change the color of the bags. Available in png format for general use.
A great big set of icons that look like stickers -- fat white outline. Includes lots of different things, including applications, web 2.0 and chainsaws and demons.
Check out this collection of 40 of the best icon design tutorials, each covering the process of designing a highly detailed graphic in Illustrator or Photoshop.