More Uses For Old Lightbulbs: Concrete Wall Hooks
It is sort of like brass baby booties; when our walls are all embedded with LEDs and lighting is part of the fabric of our house, we will be able to answer the question "grandpa, what's a lightbulb?" If we have made these lovely concrete lightbulb wall hooks.
It looks relatively easy, although whamodyne's instructions suggest a 3-1/2 inch long lag bolt set two inches into the bulb; that is barely out of the neck of the bulb. I wouldn't put too much weight on the ball part of it. ::Instructables via ::Apartment Therapy
Other Uses for Dead Incandescent Bulbs from TreeHugger
Six Uses For Old Dead Incandescent Bulbs
Bulbs Unlimited: Finally, A Worthwhile Use for Incandescent Lightbulbs
The Power of the Compact Fluorescent