I meant the pattern Thank you for all of your help ladies!

thanks merry. that one seams easy.

Stamps by Kate has a
Nice 3" clamshell stamp that has two lines. The solid line cuts out the clamshell patch and the dotted line is for stitching. I am currently using this method with beautiful results

What is easy about the clam shell is you only have to sew the convex edge since the tails lay under each shell and every added shell holds the previous one in place. A very cool pattern.

peace