I'd try a coat or two of a matte clear coat spray on a mirror. Should get you close to the desired finish with little fussing about or searching. The frosting spray tends to make it just whiter rather than just fuzzier.
That's a great effect though! Looks really fantastic with such high contrast designs in your photo above.
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Ryan
*Soft glass marbles on a National 8M because I'm slightly less patient now*
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