Your shower curtain sounds wonderful. I made one a few years ago. I offset the blocks, and once I got the 'top' pieced, I realized that I needed to cover the seams on the back, so I just layered it like a quilt, but with no batting. Then I just stitched in the ditch between each block.
Here is my post with a picture.
http://www.quiltingboard.com/picture...in-t90920.html