Eric made an ingenious clip out of a fallen toyon branch to keep our bathroom cabinet door from swinging open a while back. The screen on our living room window has been plagued by a similar malfunction. It keeps falling out. The ledge is too small to hold a traditional clip, so after picking the screen up and putting it back in place the third time on one day, I realized two toyon-inspired clips could remedy the problem.
I pulled out Eric's Japanese saws and split a felled branch scavenged from the yard, drilled it & counter sunk the top so that the screws would be flush with the clip. I fixed the screen. Next, paint the house. Well, that one will have to wait. I'll just bask in the glow of a fixed screen right now.