This is a skin from my upcoming mod: aperture science association. All credit goes to valve for making the texture sheet, I just fixed it up a bit in photoshop.
It says where to put it-in the materials folder. Rerun portal and--IT's ALIVE!!!
for more go to
www.Garrysmod.com and search for "piedoom"
or visit my page at www.freewebs.com/piedoom
thanks for your download!!!