Some months ago I asked if anyone had an idea where I could find some semi-translucent, black sticker material.

Seems, I'm not the only one who thought this was a good idea.
http://www.thinkgeek.com/product/eeb6/
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Pioneer PDP-5020FD, Marantz SR6011
Axiom M5HP, VP160HP, QS8
Sony PS4, surround backs
-Chris