Toribash
hehe don`t make a head I prefer to wear my art even when it`s not better.

every player has it`s own item.dat file which tells what items you have and don`t have in your active inventory. So if your item.dat file says that yoz don`t have a 512x512 head texture it won`t show any ingame.

And now I will write instructions.
1. Create a new folder inside your costum folder and name it "000"
2. Open your texture with gimp and do -> export as -> .tga and chose the second option and name it head.tga
3. Put that .tga file into you new folder called 000
4. Open toribash and go into singleplayer
5. write /lp 1 000

Klein Bottles only have one surface so they are the easiest thing to clean