$25 DIY Greenhouse

http://www.motherearthnews.com/diy/cheap-greenhouse.aspx

Instructables is a great Web site for do it yourselfers. I just ran across instructions for building a small greenhouse for $25. It's a fun, practical project to help you extend the gardening season.

Instead of using PVC, which isn't very eco-friendly, you might consider other plastic pipe options — or even using saplings.