What are some useful things that can be made out of picture frames (besides using them for pictures)?

Go to the dollar store and pick up cheap sponge hair rollers. Take the clip off and insert them into the frame (glass removed). You now have a ring holder.

My aunty made a framed chalk board to write messages. It looked pretty cool I thought.

Instead of a picture, paper a very large picture frame with attractive wrapping paper and criss-cross it with ribbons. The ribbons will hold mail that needs to be opened, notes from friends, birthday cards, and so on.

Painting a fake window inside them on a wall