A .blend containing a custom node group for procedural spirals. Takes a vector input such as that of texture coordinates, and then spiralizes the output. Has one output for vector to drive textures, and another factor output for controlling gradients or mixing.
The .blend has this node group in the cycles world material just to help demo how it works on a full screen, but it should work in any Cycles material.
Also note this is currently setup for generating a spiral on X & Y. Z output is set to 0. Just something to keep in mind, so you may need to re-map the vectors in or out in some cases.
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