Skins

Half-Life Skins:

Gordon Freeman Adrian Shephard Barney Calhoun
Alyx Vance Isaac Kleiner Gman
Wallace Breen HEV Suit with helmet Combine Soldier

Counter-Strike Skins:

Terrorists:
Phoenix Connection Elite Crew
Arctic Avenger Guerilla Warfare
Counter-Terrorists:
SEAL GSG9
SAS GIGN

Left 4 Dead 2 Skins:

Survivors:
Coach Nick
Ellis Rochelle

Miscellaneous skins:

Agent Smith Arctic Camouflage Astronaut
Bear Grylls Billy Mays Doom Guy
Hamburger Missing Texture Nerd
Road Worker A random guy in a suit JC Denton
Rufus Shinra Peasant Minecrafter, redux edition
Zombie, redux edition

JailCraft skins:

The JailCraft Skin Pack

Seasonal skins:

Santa Claus Santa Hat, add this to your current skin.