There are some great free rusty metal mats over at www.runtimedna.com, but if I get a chance I might see if I can add some that are a bit different. I'm not sure about commercial packages of materials. All procedural shaders don't seem very copyrightable to me, which makes it hard to sell them, or at least to stop people ripping them off if you do. I've been thinking about writing a handbook to the material room and selling that maybe.

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