When I upgraded my sound system I went very basic on adding rear speakers. They sound great but won't get many points in the "looks" department so I decided to enclose them.
Two pieces of MDF sheeting and a bit of cutting here is a very rough mock-up of the enclosure keeping the original speaker boxes.
I am planning on covering the MDF with vinyl fabric. Probably gray on the top and black around the speakers. Will add a pic when completed. Now it's off to the fabric store (talk about feeling like a fish out of water).

Two pieces of MDF sheeting and a bit of cutting here is a very rough mock-up of the enclosure keeping the original speaker boxes.

I am planning on covering the MDF with vinyl fabric. Probably gray on the top and black around the speakers. Will add a pic when completed. Now it's off to the fabric store (talk about feeling like a fish out of water).