1. On wrong side of each A and B block, mark a dot in each corner, 1⁄4" from adjacent edges.
2. Referring to Diagram 5, sew together two A blocks and two B blocks, alternating blocks and stopping and starting seams at dots, to make a tube. (Solid fabrics are shown instead of pieced blocks for illustration clarity.)
3. Matching dots, sew remaining B block to an open end of tube; clip corners as shown (Diagram 6). Repeat with remaining A block and open end of tube, leaving a 4" opening along one edge for turning, to make a cube (Diagram 7).
4. Turn cube right side out. Stuff with fiberfill to desired firmness, working fiberfill into corners. Add weighted pouch. Using quilting thread or doubled sewing thread, securely hand-sew opening closed to complete pincushion.