I love the idea of growing your own food, so this greenhouse lamp is a cute idea for herbs and other small plants. The price tag is $1,900 though, so I'm going to try filling an empty Sprite bottle with moss and tape it to a ceiling lightbulb. It will work.
http://www.glasshouse.cz/fotogalerie/ -via Colossal
http://i52.tinypic.com/fuus84.jpg
If you have trouble finding an empty soda bottle like I did, you can use any clear tupperware piece so long as it is (1) clean and (2) microwave-safe. You can even use the ones that have Spiderman printed on the sides. I also recommend duct tape, and leaving the light turned off during installation in case the bulb gets hot. :)