I designed this large set of shelves for all my nicknacks. Even though it's designed to keep filament usage to a minimum, it's still a huge print of ~12kg of plastic. It's designed to use a 25.4mm pegboard for backing.

For other designs, the rivet concept may be useful. The rivets are designed to pin things to wooden 25.4mm pegboard using spare filament to clamp them in place.