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Make twisted curl rainbows using color film, resin and packing tape. The idea is to make your surface with the colour film, dome it with resin, let it cure until it is dry but still bendable (half the time it takes to cure hard) and then wrap the piece around a cylinder (like a pencil) and tape it down to hold it in place until it is fully cured. This uses colour film from little-windows.com, but I expect normal cellophane would work just as well. One could also use pretty (translucent) paper.