I'm actually not a fan of skins at all, but a buddy of mine has made a few that I think are pretty cool. Sadly some of them have our clan tag, but I think I may install them for a few days for shits and giggles.
The original Backburner head (definite download for me!)
Spy Knife (no special name)
Godspeed's Nerf Pistol
This is for a guy that's an infamous scout in our group, he's annoying as hell with the scattergun. As a spy, he's the bane of my existence (I'd rather fight a pyro than Godspeed).
WARNING: Clan logo on it (but not very noticeable)
Noob Toob Rocket Launcher
WARNING: Clan logo!
Duff Beer Medpacks (I've got no idea lol)