I am making 9-patch blocks with my 2 1/2" squares. I was in a swap recently and we swapped 9-patch blocks. We used 5 scrappy 2 1/2" squares and 4 white squares. This block will be 6 1/2" unfinished and I am making a friendship block for the alternating blocks. It is fun to get scrappy blocks from across the country. There are so many patterns you could use your 2 1/2" squares for and I think you will get tons of ideas from all of these wonderful board members. Good luck and let us know what you decide.