Terri, the block I did was from Marcia Hohn's site, Blocks Galore. It's a biggie. If you go to her site and look under the heading blocks over 16" or so, it's in that list, the Carpenter's Wheel.
I used 3.5" thangles. I'm actually making it again for a wall hanging because I played around so much with blocks and colors that I've got enough to make another one.
I'm also making matching pillows -- though not in the carpenter wheel pattern, the bambury cross pattern.