This block was a fairly simple one. My hardest part was deciding whether to treat it as the original 7-patch, or change it to a 9-patch, Some of my ideas from EQ7.
I decided to go with the one in the lower left of the second picture. I wanted to be able to throw in some of my black text fabrics. I ended up choosing a pink and a green batik for the "blocks." I also deviated from the instructions by cutting my HST squares at 3 7/8" I don't like to waste fabric when I don't have to cut larger blocks. This method of HST has been pretty successful for me.
Here's the finished block.
And I really do want to fill in the Sudoku puzzle on one of these someday...