Clamshell pantograph
Free pantograph from pantomaker.com
Stitch it on any quilt, including quilts you sell

One repeat: 15 in wide, 2.50 in tall.
Offset every other row by half a repeat (7.5 in) so the shells nest.
Use the file your machine reads:
  .qli  Gammill Statler, Handi Quilter Pro-Stitcher, CompuQuilter, APQS
  .hqf  Handi Quilter Pro-Stitcher
  .txt  Handi Quilter Pro-Stitcher
  .iqp  IntelliQuilter
  .dxf  IntelliQuilter, Innova AutoPilot, Art & Stitch, CAD and design apps
  .pat  Innova AutoPilot
  .bqm  Bernina Q-matic
  .cqp  CompuQuilter (older systems)
  .plt  QBot / 4QB, PC Quilter
  .qcc  QuiltEZ Quilt Manager
  .ssd  Side Saddle
  .svg  Inkscape, Illustrator, Cricut / Silhouette, design apps

Design your own at https://pantomaker.com/
