My layout is built in our basement storage room. So the area underneath has to be accessible by my wife and kids (it's not just train storage). I needed something that was durable and functional. I bought these curtains from Amazon. They come in a variety of colors and lengths. Mine are the 36" length. For curtain rods, I used 1/2" electrical conduit. Ten foot sections of conduit are $2.50 at Lowe's or Home Depot so that's tough to beat. They sell stand-offs for the conduit so it's easy to mount (second pic). The stand-offs are .50 cents or so.
