I found these quilt blocks at the thrift store.
Courthouse Square: There are 15 of this one. At one time it was sewn into a top (you can see the seams), but for some reason taken apart. The blocks measure 15" x 15". $1.00
Double Monkey Wrench: There are 29 solid light background and 30 floral background with brown center. These blocks measure 13" x 13". 75 cents.