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 VSX-1018AH-K, PDP-5020FD, DV-79AVi
Axiom M22s, VP150, QS8s
Sony PS3, surround backs
-Chris