Easy and handy photo frame
The photos are easily replaceable. This is a handy solution if you want to have pictures on your wall but you don't want to tape them.
Cut a piece of ribbon. Stretch the ribbon diagonally across the board from the left to the right and attach it at the back side of the board with tape. When the board is filled, put a second layer of ribbon on it, diagonally in the other direction. At the crossing points of the ribbons you pin a pushpin.