Things You'll Need
Instructions
Load GCFScape (see Resources) and open your "GMod" installation directory. Open the Steamapps folder and locate the file "source materials.gcf." Double-click the file to load it through GCFScape.
Browse the model or skin directory to find a suitable character type to use. Right-click to save and extract the model file to a different location on your computer.
Open the model or skin file with your photo editing software.
Edit the character model however you want. Change the color scheme of the model and re-create it with the photo editing tools.
Save and close the file when you are done. Return to your "GMod" installation path through GCFScape and copy the file into the models folder. Close GCFScape and load "GMod" to find your newly created character.