1 - 12 inch block from 44 inch fabric bolt width
Half square triangle units are all that's used to make this block. A secondary pinwheel is revealed with the third fabric when at least four blocks are put together.
Unit A - fabrics 1 & 2; make 8. Unit B - fabrics 1 & 3; make 8.
Using 8 each of unit A & B, sew block together as shown in layout with 1/4 inch seam allowance. Press seams to one side.
[top]Tip: Put desired fabrics right sides together and then cut squares. This way, square pairs will already be matched.