100s Of Free Icons With Different Backgrounds
Axialis Software, the developers of IconWorkshop, have created multiple good-looking icon sets.
Most of the sets are built from a 200+ pieces of flat icons & have different backgrounds or colors.
Besides these icons, there is also Web Mini icons which consists 237 colorful icons in 16*16px sizes.
All sets come in .PNG, .GIF & .ICO formats.