Work On It: Pinning Boards for Fabric Collage | Susan Carlson Quilts
8 Pieces Foam Boards 12 x 10 Inch White Foam Core Backing Boards, Silver Craft Knife with Protective Cap and 12 Inch Stainless Steel Ruler for Art Presentations Crafts Display Favors | Walmart Canada
PVC Foam Board - White - 1/4 inch thick - various sizes – Falken Design
UltraBoard Core - UltraBoard
1-in x 4-ft x 8-ft Expanded Polystyrene Board Insulation in the Board Insulation department at Lowes.com