Matt167 has a good source, but if you want to make some Custom Panels, I would start with this:

http://www.usplastic.com/catalog/var...ookie%5Ftest=1

You can heat it, and bend it, it will keep it's shape-then, if you want to make a pattern (or shape) in it, use this:

http://www.foambymail.com/Volara.html

I have purchased this Book by Ron Mangus-lots of info:

http://www.ronmangusinteriors.com/pr...products_id=28 init-

Hope this helps-