I have always enjoyed the string quilts. They go together easily and look great when you're finished. You could put maybe black as the center of each block and then use that to make different designs when you put the blocks together. You could even divide the colors into light and dark and then use them as Log Cabin with the shades.
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http://3creativestudios.com/freeproj...heet_quilt.pdf]
See what you think!