http://www.brownpaper--packages.com/2010/08/flag-blocks.html (thanks Kierste). I wanted mine a little more even to fit together better, so I trimmed the blocks I used for the star and glued the pieces I cut off between the two blue blocks. Now it is closer to even and square and the same thickness top to bottom. The blocks don't shift at all when moving and the fabric covers the seam and filler between the blue blocks, so it looks like one big block. I like it. If a more primitive look is your thing, go with the brown paper packages model!