Quilt block diagram

Snowball quilt block

Four contrasting corners clip a large center square into an octagon that connects cleanly in repeated layouts.

Block structure

How the geometry is organized

A central octagon formed by placing one right triangle in each corner of a square block.

  1. 1Start with one large center square.
  2. 2Mark equal corner depths on all four sides.
  3. 3Add four matching corner triangles and keep the diagonal lines symmetrical.
Repeat this block

Finished-size planning

Basic unit sizes

These values divide the finished block evenly for drawing and layout. They do not include seam allowance or method-specific trimming.

6 in block1.50 in unit
8 in block2 in unit
9 in block2.25 in unit
10 in block2.50 in unit
12 in block3 in unit