I volunteered to help a local charity haunt with a couple of their rooms. Since the next area is a town where zombies are roaming I thought the perfect choice would be to turn the first room into a clean room entry into the lab that accidentally created the zombies. The lab room is about 11 by 16 and I was trying to figure out a nice cheap way to make lab walls. The room was built with old garage doors so there is no problem attaching materials to it but I wanted to have something much more clinical. Of course since it is a charity haunt I need to do it on the cheap. My first instinct was Terra's video on creating steel panels using styrofoam but I am guessing it would take 18 sheets at around $12 per sheet or $216. So I am hoping for some suggestions for even cheaper ways to make the walls. Feel free to throw in any ideas for things to put in the two rooms. They actually have quite a bit of junk around the building I just need to find the materials I can use.