I saw a video a few weeks ago about zendoodles. The idea is to draw a straight-edged shape, like a triangle or a trapezium, and then draw a spiral of similar shapes inside the first one. When you draw a heap of these shapes next to each other, you get some pretty cool patterns appearing!
Simon Says Stamp Wednesday Challenge blog, for their 7th birthday challenge!
Less is More for their One Layer Card challenge - Geometric.
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