This effect was generated in Filter Forge, a Photoshop plugin that allows you to create your own filters.
I know there are some Metalizers and stuff out there, but I'm curious what kind of feedback I get. This Basically takes your image, and makes it look as if someone had a spraycan of Chrome and just soaked the thing with it. Like in that one Spongebob episode. ;]
Mirror controls are Thickness of Coat, Reflectivity, Chromeness, Mirror Diffusion, and Mirror Tint. Simple really.
This filter has earned its author one of our rewards. They are given to the authors of popular filters and include a free copy of Filter Forge.