Silver, non-metal bumpers besides SGP Neo and Thinedge?

[Baggy Spandex]

Anyone familiar with any silver, aluminum look bumpers that aren't made of metal? I'm a fan of the SGP Neo's looks, but I can't justify $30 for a bumper like that for my 4S. I'm looking to pair it with a silver rear panel replacement and think it would look pretty sharp. The Thinedge looks like it may be too bulky to work aesthetically with the metal back.

Thanks!