I made this easy fabric tent so that all the children in my class (22-25) could fit inside while I tell the Bible story. I bought the fabric on a clearance aisle at Wal-Mart. I have used this for many stories about Moses, Abraham and Sarah, Paul, etc.
It takes about 5- 10 minutes to set up and take down and stores very easily. For instructions (with photos), click here.
I used approximately 7 yards of fabric that was 60 inches wide.