Christmas Social Icons
The “Christmas Social Bookmark Icons”, a collection of 17 freeware icons in iPhone-like style, includes icons for Blinklist, BlogMarks, Delicious, Digg, Facebook, Feeds, Flickr, Furl, Magnolia, Mister-Wong, Netvibes, Newsvine, Reddit, Stumbleupon, Ta-Da List, Technorati and You Tube. All icons are sized from 512X512 to 16X16 pixels.

iPod Christmas Icons
4 iPod icons of Christmas, 2 for white iPod, 2 for black iPod. Available for Linux, Mac, Win.

Winter Holiday Icons
Free Christmas icons.

Iconka.com Icon Sets
A number of icon sets free for personal use. Mostly .ico and .png. And mostly for Mac and Win.

Christmas Icons
Cartoonish Christmas iconspack, 4x png, 4x ico.

Christmas Holiday Icons Pack
49 icons in various formats: GIF, PNG, ICO (favicon purpose), and vector EPS (print purpose). It is free. You can use them for any purpose — commercial or personal. Also 16×16px versions are available (mini-icons).