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This is a video tutorial that explains how to make a pinwheel square using the Tunisian crochet. The tutorial will walk you through making 4 different patterns as shown in the picture.

While this is a pattern for a potholder, it could be used as a motif used for something else; the two-colour spiral is attractive in its own right.

Four-colour spiral crochet with the outer edge crocheted in a fifth colour.

This looks very cool, though I'm not sure how practical it is.