I would probably just pick up stitches along one edge of the completed square in my new colour. And then you could stop at, say, a length of 4 or 6 squares, and just have the long seams down the edge to sew to other bits of afghan.
(Other people may have better techniques, though!)
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Date: 2011-03-14 08:29 am (UTC)(Other people may have better techniques, though!)