(Yes, those are sticky-posts and not business cards because I couldn’t find any that I’m willing to cut-up. Sorry I didn’t have time to look for other business cards but the idea is still the same.)
With a few cuts and a hole puncher, a business card can be used to keep paper organized.
Use just one, it can make a small notepad from scrap paper or keep random sticky notes together in a pile. Or, just use it to keep other business cards in a stack.
Use three, it can even keep sheets of paper together as a booklet when a stapler can’t do the job.
It holds pretty well even without tape if you tuck-in the center piece after the loop. (You can sort of see it in the blue-paper picture)
I was also thinking it can also be combined to make curtains/blinds because they can also attach to each other…
