Quote Originally Posted by southcac420
.. poster board! its white and reflective and most of all cheap... the only negative thing i can think of is that if it got wet it might mold... but if i was careful when watering i dont think it would be a problem... please post any pro's and con's you can think of ASAP i want to get started soon...
I'm picturing in my mind.... a huge Chinese lantern.

Remember, what you use has to block light, as well as reflect it.