Had some paint peeling under there for some reason (I'm guessing from rocks when driving on the freeway and such). I saw a video where these dudes took a VW and rusted it out and did the fenders like this and gave it a try.
Took an anime manga book, some 3mm adhesive spray glue, and a clear coat to make. Took like 3 hours to do both sides. I found that it works better if you dampen the paper with a spray bottle and then apply A LOT of glue before sticking it to the car works better. The parts I didn't spray down first with water will bubble up when it's moist outside. Also took about 3 heavy coats of clear to get it feeling smooth and plastic-y.