"Idea" is often symbolize with a light bulb. This product may then be considered an über-idea. And it is in fact a very good one. Not only you can recycle used bulbs but you can use your creativity and make some interesting lamps for your house or office.
Here you can see some ideas of what can be done. And while normally I am not a fan of the Do It Yourself that so much seems to please the (north)American crowd, this is an exception: while you can buy a kit to make them, I guess is not so hard to try without the kit. What is the the worst that can happen? That you will ruin a couple of used bulbs? (One warning though: as they will be heated by the light in the center, make sure you use a safe glue).