Ballicons – Download Flat Icons.
Ballicons is an extended set of colorful flat icons. All of the round icons were created with Photoshop vector shapes in uniform size of 128×128 pixels. You can still change the color or size of the icons. The set includes 15 free icons (PSD, PNG) and the complete icon set consists of 80 icons (PSD, PSD@2x, PNG, PNG@2x).
You can download the Ballicons set on ballicons.net