The fabulous KnitSteph was talking about mitered squares in chat today, and I mentioned I'd always wanted to know how to make them. She told me they were easy, and pointed me towards this tutorial. Finally, mitered squares made sense to me! I always thought there was complicated knitting together of triangles or some such thing. Nope! The decreases in the middle make the mitered square. It's easy! Look:
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Sorry for the photo quality; it was taken by my camera phone. The yarn? It's Colinette Jitterbug in the Popsicle colorway.