i work at a supermarket and was looking at them and i thaught about how efficient they'd probably be.:hubba: seeming as how the styrofoam would make it warm inside the tray.kinda like an incubator ...anybody every used one? If so what were your results as far as germination times? It would probably be the same results you'd get if you used a heating pad put I'm thinking the styrofoam would work without energy and theres no chance of a fire or anything like that. "ego-friendly"