The classic 3D optical illusion. Light, medium, and dark fabrics create the cubes. 🔗 Free template: Quilter’s Cache – Tumbling Blocks
Create an over/under woven look using rectangles and background sashing. 🔗 Free pattern: The Crafty Quilter – 3D Woven Block
For strong 3D effect, use high contrast (e.g., deep purple, bright pink, pale grey). Solid fabrics read better than busy prints.

