When I hang up puzzles, tins plates, or photos, I often hang something cute on the top or bottom push pins. This gives you twice the bang and half the holes in the wall.
Wooden Quilt Patterned Barn Star
Fixing a Push Button Toilet
How to Make a Clothes Hanger Wall Decoration
Making a Sandal Keyholder
Making Button Bulletin Board Pins
Alternatives to Push Pins