Ok first of all, with those dimensions your quilt will be off center. I personally wouldn't have any problem with that, but just thought I'd point that out.
I drew it up in EQ. Per the fabric requirements printed for this quilt, the purple would require 4 5/8 yards (assuming 40" wide fabric), which you then divide by 4 because you want to use 4 colors. EQ is notorious for over-estimating yardage, but I always figure it's better to go over than under. If I were making this quilt, I'd get 1.25 yards of each color.
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Last edited by Peckish; 09-14-2012 at 01:13 PM.