I did the following. I would resize the image (DPI, size, etc) with IRFANVIEW and then print it at 1:1 size and let it print out the sheets then cut and paste the whole thing on the wall because we didn't have a wide 36 or 48 inch printer.
Would that do the trick?
Does anyone know of imaging editing software that will allow me to divide an original image into uniform rectangles which can each then be printed in a larger size, say A-4? While there are lots of jig-saw and puzzle-making programs, I can't find one that will allow me to create a collage of uniformly-sized elements larger than the original.