Hello ladies! I've found some more D.I.Y. tools for the classroom that also double as science projects. I think these projects are sutable for grades K-12 too :) Here they are; enjoy!
Homemade Rain Gauge:http://www.ehow.com/how_4841012_homemade-rain-gauge.html
this next one doesn't come with a picture, so I found a picture online of the correlating project: