For those interested. I found these brushed aluminum duplex plates doing a Google search.
Brushed Aluminum Receptacle Wall Cover Plates
Pass & Seymour brushed aluminum 1 gang duplex cover plate.
Pass & Seymour brushed aluminum 2 gang duplex cover plate.
How they will impact the sound from your audio system? No idea. For a DIY plug and cord power distributor it may look better than a non breakable nylon duplex plate.