I don't know what the size of your blocks are but let's pretend they are going to be 6" finished. Cut your two colours in strips 3 1/2" wide. Join the strips along the length of your fabric and press. Then cut the joined strips into 3 1/2 " pieces. Reverse some of them and sew them to make your four patches. Hope this helps. Remember to use 1/4" seams all the time.