I found this stuff at Lowe's today that I immediately thought of you guys on this forum. When I saw it is looked like a roll of hay. The roll is 4 feet wide and covers a lot of ground, or walls. I figure you could use this as set dressing. Oh, It comes in lengths of 50 feet or 100 feet. It's called germination blankets, check google for better costs.
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germination blanket.jpggermination blanket1.jpggermination blanket2.jpg