Glass etching is a simple way to decorate, and if you're not into Halloween you could--instead of etching pumpkins--decorate the glass with leaves, acorns, or whatever motif strikes your fancy.
I bought a glass globe at Walmart for under $2, then using some masking tape I taped little triangles for eyes and a nose, and outlined a simple jack o' lantern smile in tape. Using a small amount of etching paste (which can be expensive--$30 for a small jar--but it goes a long way) I painted the exposed areas that I wanted frosted.
Notes: Be careful not to get the paste on your skin or clothing as it is acid and will make a nasty mess of things--like eyeballs and mouths. Also, make sure the tape is securely in place, rub it along the edges to make sure the edges are sealed and won't leak acid underneath. You can use contact paper instead of masking tape but with the rounded surface, the contact paper tends to wrinkle too much, the smaller pieces of tape are easier to work with for this design.
After waiting five minutes for the acid to work its magic I rinsed off the paste (you can also scrape it off and put it back in the jar if you're trying to conserve) and dried the bowl. Instant frosted jack o' lantern suitable for a candy dish, floating candle, tiny fishbowl or even a bowl of Jello. They're inexpensive enough to make a fun grouping of them down the middle of a table for an easy centerpiece and look especially fun with colored water or votive candles.
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