The crazy 9 patch I've done twice. The first one I mimicked the lines in the crazy 9 patch (or wonky tic-tac-toe) in the solid blocks and did all-over loop-de-loops in the 9 patch blocks (pictured is the back of the quilt so you can see the quilting easier). The other one I did giant interlocking circles over the whole quilt ... I used three different size circles (the largest being a large dinner plate, the smallest a saucer).
Pic's of the quilting for both of them below.