Sashing really comes in great when doing a block swap. Not everyone's block is the right size. Cutting sashing a little to big, then trimming down to the correct size can solve a lot of problems of the blocks not being the right size. I have been in swaps where the unfinished size was suppose to be 12 1/2". The smallest was 11 1/4" and the largest was 13 1/2". Also, the sampler quilts look better sashed that way it frames the block and separates it from the next block.

Have you seen the window paned disappearing 9 Patch that Jenny filmed? https://www.youtube.com/watch?v=oZfn...69C28&index=26