You could cut 2 1/2 inch squares plus one 4 1/2 inch square. From the 5x7 swatch you get 2 squares @ 2.5 inch and 1 square @ 4.5 inches.
Make a 4 patch with the 2 1/2 inch squares and alternate with a 4 1/2/ inch square. There is probably a name for this block somewhere.
Have fun!