More Uses For Old Lightbulbs: Concrete Wall Hooks
by Lloyd Alter, Toronto 
on 08.18.08
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
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Here's a million dollar idea. You could also use concrete filled lightbulbs as door knob handles. I better hurry and start my own company. Any interested investors out there?
With cement production being a huge source of GHG, it doe's not seem very treehugger to dream up new uses for cement, just to recycle a light bulb screw cap.
Is the footprint of the (admittedly small) concrete use worth it?
I like the idea of getting old doorknobs from a building salvage place, mounting those on a strip of wood, and putting those on the wall for hooks -- they look neat, if you find cool doorknobs, and don't require adding new stuff, especially something like concrete.
This is simply the most absurd idea I have ever seen on these pages.