Lontar Icons has designed some great and Free Icon sets, icon sets are completely free to download you can use for personal use or can use it commercially. The icon sets included are social media icons, chococons social media icons, christmas Icons and Cow icons. Sizes available are 16×16, 24×24, 32×32, 48×48, 128×128, and 256×256.
Lontar Social Media Icons Set
Chococons Social Media Icons Set
Social Balls Media Icons Set
Credit Card Pixel Icons
Remember The Cow