I took a basic idea and made it into a leaf; more to come. The STL might be big, but you can scale down both models, and they would still work. I'm not totally sure about the size of the suction cups, so for the original size, whatever the original creator used, because I made the holes the same size.

I will add a blank model without holds for suction cups that can be secured using double-sided tape. I recommend double-sided gorilla tape.