Originally Posted by Jim's Gem
For me it depends on the size of the quilt I need and also I take into consideration the size of the pieces in the block. If it has a lot of 1 1/2" pieces I might make it that big. You want your sashing to look like it goes with the quilt, don't make it way off from the size of pieces in block.
This is what I do also, it also dictates whether I sash all of the blocks individually, or use one :D:D:D