Scratchbuild Mud Flaps?

I'm not sure about thickness, and I've never tried to build mudflaps, but the styrene I use for scratchbuilding is Evergreen....and they have bags of strips, tubes, and sheets for a decent price in a large variety of sizes(around $2.00-$3.00 per bag). If your LHS doesn't have them, I think you can order direct, as I have no idea where you could order some. The website is:
http://www.evergreenscalemodels.com/

I've used thick packaging type paper painted with acrylics seems to look OK on 1/24th and I've also used thin styrene but depends upon the thickness of the finished mudflap and what looks best on the model and how/where its to be fixed to the body.

The hobby shop up the road has evergreen. I have the .15 but was wondering if I should us thinner sheets. I really want to try and make it out of rubber if anybody has any tips for that idea, I'd really like to hear them.
Thanks

Personally I'm not sure if they make rubber that thin, but it will be interesting to come up with ideas....I'll rack my brain, and search the apartment long and hard, and let ya know if I can think of anything!!

I would recomend using paper and painting them. That will give you the scale thinckness. if you really want to use rubber, I've seen real thin rubber used to wrap products like ink toner cartriges. These are sometimes square, so you'll be able to cut out a few small square pieces. I'm trying to think of more products that use this cover. If I find any more, I'll let you know.