Hang pictures from door knobs... very cool idea!
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How to turn old door knobs into hooks for the wall!
25 Unique Vintage Door Handles >>> This would be fun for a little kid's room, especially if the eyes could be made to roll or jiggle when the knob's turned.
Vintage Door Knob Handle - I think a cut of a door with knobs like this would be great vintage mirrors and frames....
Vintage door knob wine stoppers = genius
Used to love these in my grandparents' old farmhouse.