Blue & Yellow. Use a dark & a medium blue, a light and a bright yellow.
Cutting:Dark Blue: Cut 2 squares, 3 1/2"Medium Blue Cut 4 squares, 3 1/2"Light Yellow Cut 2 squares, 6 1/2"Bright Yellow Cut 2 squares, 3 1/2"
Assembly:
One dark blue, two medium blue & 1 bright yellow are assembled into each small four-patch block. Then assembled with the light yellow squares into the finished four-patch block.