Something I think would be useful:
Scissors that make a row of really-close-together tiny holes. Like perforations. This would enable you to make something that could later be torn really easily.
My use for this would be for my sticker-making hobby. Let's say I wanted to display a roll of small stickers on the backing. If I had these scissors, I could score a line between each sticker. Then the user could just rip off one.
These could also be used when you're making flyers: You know the part at the bottom where people rip off your phone number?
There probably would be 1000 other creative uses for arts & crafts.