I was visiting a friend's house this weekend. While we talked her cat started to howl and scratch its face. The cat had been treated for ear mites and now had some rash causing the cat to scratch its face and bleed. So I offered to make a collar for her cat to ease its pain. Using cardboard, foil tape and some gold lacing I made up a working collar. She was able to eat, sleep and use the littler box without any problems and was finally healing up.
There was a lot of cat drama for a few hours but by the next day she was adapted to her collar and was healing up.
UPDATE: She had a yeast infection causing her face itchiness. She did get the collar off after 3 days, but she had healed by then after seeing the vet.