[Destinatus]

Does anyone know if you can buy these or how to make them? I think it would be really cool to play with.

http://en.wikipedia.org/wiki/Claude_glass

"A Claude glass (or Black Mirror) is a small mirror, slightly convex in shape, with its surface tinted a dark colour. Bound up like a pocket-book or in a carrying case, black mirrors were used by artists, travellers and connoisseurs of landscape and landscape painting. Black Mirrors have the effect of abstracting the subject reflected in it from its surroundings, reducing and simplifying the colour and tonal range of scenes and scenery to give them a painterly quality."

[balistic]

A welding mask or goggles would work. Any big hardware store should have them.

edit: oh, you want a mirror ... hrm ... well, welding goggles will do the same thing, just without flipping the image.
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brian.prince|light.comp.paint

[burn0ut]

what balistic said works, or you can spraypaint one side of a handheld piece of glass black.