Picture frames out of old cabinet doors, and a clip so you can change out the pictures. Cute! Tutorial.
A detail like this would be so cute above my desk in the living room. Maybe paint it the same color as the tv stand.
This idea would also work well to display/organize kids artwork throughout the year. Designate a certain number of hangers for the year. When the hangers are full & a new artwork comes home to be hung, one comes down & is either stored immediately as a keepsake or given the heave ho.