I’m kind of in love with http://materia.nl/, a really beautiful resource site for designers. They showcase a ton of incredible, high-end materials that can be ordered in bulk, and you can request samples of most of them (though they don’t always say yes to the requests). They have a newsletter that I look forward to every month–it showcases some pretty amazing stuff that I either lust after as a supply or that inspires me to do something similar.
Here are some things they’re featuring this month:
Leather wall tiles, including laser-etched ones and stamped ones (that could be stamped with a laser-cut Delrin stamp)
Sheets of tennage (Japanese-style hyper-thin inlaid wood veneer) that are so flexible that one of the recommended uses is handbags
Barktex, a fabric made from the bark of a Ugandan fig tree and a water-based resin of some kind.