The plan has always been to quilt each turtle in a different design.
Turtle #2 is a kind of radiating flower design. Starts in the center and goes out, just like the spiral, but it offers a lot more opportunities to start and stop without obvious glitches in the stitching.
Turtle #3 is a kind of pebbled design, which really shows up well on this fabric. I think it might be my favorite turtle so far!