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This tutorial shows how to make a little charm using epoxy clay, mica powder, and a stamp. One could probably use other types of clay, such as polymer clay or air-dry clay, though the effect might not be quite the same.

Square (or rectangular) rubber stamp + painter's tape + resin = interesting textured plate! The depth of the texture depends on the depth of the stamp. Also only works with rubber or silicone stamps; the transparent ones get stuck to the resin.