LOVE this idea! Rather than etching the design, etch everything BUT the design for a frosted jar! (Tutorial) After you have done the etching, and before you remove the decal you could go back over it with alcohol ink to tint it too.
DIY with Candle Impressions Flameless Candles (cream pillars would be best), birch bark, twine, walnuts, and a shallow bowl. Birch bark is extremely flammable so don't forget to go flameless! paint the stuff blue and or blue candles