Things you will need
1. Acoustic fibreglass or acoustic media
2. Acoustically transparent fabric
3. 1'x3' wood pieces, 2 pieces 2 feet long, 2 pieces 4 feet long
4. Glue and staples
For a full list of acoustic materials needed read more here.
Acoustic fibreglass
The best material to use is fibreglass that is semi-rigid, so it maintains it's shape. Owens 703 or 705 will work. Ideally 2" fibreglass is the best.
Acoustically transparent fabric
Go to Fabricland and ask for material that is about 97% polyester and 3% spandex. If you choose black, you won't be able to see through it, which is good. With a light coloured fabric, you will have to double up the fabric when you cover the panel.
Wood
Home Depot, Lowes or Rona can provide some basic wood for the frame
Glue and Staples
Simply wood glue and a staple gun capable of stapling material to wood.
Now put it all together
Create a frame from the wood, that the insulation will rest in.
Place the fibreglass into the frame
Wrap the frame with the fabric you bought and staple it on the back of the panel
Watch this youtube clip on how to make acoustic panels
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Tim Tippets - Voice Talent: http://www.timtippets.com
Another youtube video:
Another instructional video by http://www.mphazes.com
Another youtube video:
A slightly different design:
Here is a great demo, on a before and after acoustic panels, scenario.