They should love this! I was thinking you must have a very good printer. I hesitate to try any photos because I know my quality printing would be unsatisfying.
I have a printer HP deskjet 2630. Not an expensive one. But why don´t you try a copieshop, think they can help you
If you go to a shop, ask them for a test on normal paper first. The fabricpaper is quite expensive
This is a wonderful gift!! So impressive!
Unique and will be so special to your daughter and her boyfriend