I started with a courthouse steps block for my 1.5 inch strips this year, but as I started making test blocks, I decided to do a bulls-eye layout. To get the final design, I will make half of them with dark centers and half with light centers.
Each block has 13 pieces, but they are all rectangles of increasing lengths cut from 1.5 inch strips. That makes it easy to collect and organize. The length are 1.5, 3.5, 5.5 and 7.5 inches.