DIY acoustic panels?


I took a look at gikacoustics.com and thought the sound absorption panels were actually pretty good and reasonably priced, but I am interested in making my own to better match my room.

Does anyone know what type of cloth is good for sound absorption, hopefully something that is readily available at fabric stores?
bobk3
DO NOT use live sheep as, although effective, they're messy and hate being stuck to a wall.
There are alternatives to everything, including big insightly refrigerator size panels and low WAF tube traps. You got your tiny little bowl acoustic resonators. You got your Mpingo discs. You got your crystals. You got your Corner Tunes from Michael Green. You got your Golden Sound Acoustic Discs for room corners. All you need is the XLO Test CD so you can determine precisely where to place the stuff since, you know, instructions are oft times too general to get you on right on the money.
Check out the women's pant suit fabric. They have grey and black at Joannes Fabric. Do the blow test on any fabric you are looking at . Blow through it and if it lets all the air through it is suitable . The women pant material looks exactly like Magnepans fabric . Find one of their 50% off coupons too . 
OP - I will load a pic of my diy stuff so you can see the pant material I am talking about . it will be in my system page .
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