Last year I participated in a 12 inch block swap. We each made blocks of our choice to swap using only black, white and one other color of our choice. I received 13 blocks and added 7 of my own for a 20 block quilt. The blocks have been sitting in a UFO pile so I dug them out and added sashing this weekend. I still need to add the same sashing to the top, bottom and sides but at least now the blocks are out of the UFO pile and almost in the flimsy pile. I think the black and white sashing really tied all of the blocks together.