More to explore:
Soda tab screwed on the back of a pic...instantly be able to hang anythingTips & Tricks To Make Life Easier! | Just Imagine - Daily Dose of Creativity
pop can top used to hang picture frame.
Hanging a picture using a pop tab
DIY Picture Hanger pop tab, picture frame, screw. PICTURE HANGER!
great diy ideas pop tops to hang picture frames on a wall
Use a soda tab as a picture hanger.