Christmas Design Assets by Iconfinder - Sprinkle up your seasonal content with these festive goodies.
IconStore - Free icon packs by first-class designers
Creative Market - Buy and sell handcrafted, mousemade design content like vector patterns, icons, photoshop brushes, fonts and more at Creative Market.
Feather Icons - Simply beautiful open source icons
Christmas HQ - Totally free holiday icons, images, borders and fonts
Iconjar - Store all your icons in one place, just a click away