I'm thinking about doing a granny square blanket too. I want to use 12 inch squares but make it like a sampler blanket. So here are a few 12 inch square patterns that I've found to be interesting.

http://smoothfoxlover.blogspot.com/2010/07/smoothfoxs-amethyst-square-12x12.html

http://www.grannys-garret.com/pattern/big_june_square.pdf

http://dayna.tdgservices.com/ShowPattern.aspx?PatternID=25

http://www.yarncrazy.com/butterfly-garden

http://smoothfoxlover.blogspot.com/2010/08/smoothfoxs-c-word-clusters-12x12.html

http://www.yarncrazy.com/cable-hearts

http://sewhooked.com/2009/08/04/crochet-chained-compass-motif-with-variations/

http://mocrochet.blogspot.com/2011/02/crazy-granny-square.html

http://www.yarncrazy.com/cygnus

http://www.yarncrazy.com/double-framed-lace

http://www.yarncrazy.com/draco

http://www.yarncrazy.com/esthers-square

http://www.yarncrazy.com/flower-burst

http://xxcatalopexx.blogspot.com/2009/08/12-great-granny-bars.html

http://mocrochet.blogspot.com/2011/03/half-n-half-12-square.html

http://www.crochetville.org/forum/showthread.php?t=118634

http://dayna.tdgservices.com/ShowPattern.aspx?PatternID=91

http://dishclothdiaries.blogspot.com/2010/07/majesty-square.html

http://www.yarncrazy.com/mandala

http://www.yarncrazy.com/windowpane

http://smoothfoxlover.blogspot.com/2010/04/smothfoxs-whole-lotta-holes-12x12-free.html

http://dayna.tdgservices.com/ShowPattern.aspx?PatternID=58

http://mocrochet.blogspot.com/2009/11/versailles-12-square.html

http://www.sandimarshall.com/triangle-vs-sq/

http://www.yarncrazy.com/tilt-a-whirl

http://www.yarncrazy.com/supernova

http://dishclothdiaries.blogspot.com/2009/06/summer-romance.html

http://www.crochetville.org/forum/showthread.php?t=118629

http://dishclothdiaries.blogspot.com/2011/02/pink-crush.html

http://www.yarncrazy.com/pavo

http://dishclothdiaries.blogspot.com/2009/10/mums-word.html

http://mocrochet.blogspot.com/2011/04/more-vs-please-12-square.html