DIY acoustic panels?

My listening room has to serve multiple purposes. And my wife is not going to let me put anything ugly or even technical looking on the walls (not that I want to either).

Ceilings are 10’ so I’m not messing with them. Left wall is 1/2" thick wood paneling but is mostly take up by two windows with heavy drapes. Back wall, behind listening position is all window, but again, behind heavy drapes. Wall behind system will soon be all books. The right wall is the issue. Solid brick. There are two areas, 4’x8’ that probably need attention. My plan is to hang oriental rugs over the brick in those places. Wife is okay with that idea and she will source the rugs. She knows where to get nice looking, older, but not high end rugs for the purpose. Still probably several hundred a piece.

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 .