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I built mine out of 1 x 4 pine and owens corning 703. SPI (just do a google search for SPI acoustics) sells 703 and 705 in 2 x 4 pre-cut panels. If you want to glue two together to make a 4 inch thick panel, you can just use liquid nails for foam board around the perimiter of the 703 and glue the two pieces toether back to back. Don't coat the panels with glue though, just around the edge.
Its best to hang them from the ceiling on wire (I used suspended ceiling wire at H.D.) and eyelet screws (also for suspended ceilings). Then you can space them off the wall, which will help your bass response. Mine are 4 inches thick and are 4 inches off the wall.
You can also find fabric on E-bay. Be careful with fabric through, you want something that you can blow through so sound will pass through as well. Some fabrics will be reflective, which defeats the whole purpose.
Good luck.
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