makes use of mirrored surfaces in painting this Tiko Destroyer from 
Would you find this product useful on your hobby workbench?
I found this in the craft aisle at Dollar Tree. The 'stickers' are 3-dimensional and half-spherical, and come in a variety of colors.
When you get past the packaging, what you find is a clear sheet of stickers – 216 of them. Lines of clear adhesive bind the stickers to the sheet. The stickers pull off one line at a time, unless you cut the adhesive strip first.
Above, you can see a 28mm Kryomek figure posed with the stickers.