My oddball formats are 6x17 and 4x10. I find the 6x17 format with a 90mm is the bomb for dramatic landscape, and it packs easy. The 4x10 is done with masks in my 2D- so two shots per 8x10 sheet. I've only goofed with it a bit, but I think it will be an interesting aspect ratio for certain still life shots that I want to contact print.