I recently took a class at SPQG from Wayne Kollinger of Tuxedo Designs.  Really enjoyed the class.  It was about using traditional blocks made on a 9 patch grid to design other blocks.  It was especially interesting when we combined different blocks.  Here is my favourite design from the 4 blocks I made for the class.  Our first step was to cut our original blocks into 4.  I seem to remember that my original was called Calico Puzzle.