Turn any decorative (i use wine bottles) bottle into an ashless incense burner. With less than seven dollars worth of diamond chip dremel bits, you can drill a hole to allow airflow in a nice bottle without shattering the glass.
Wear a dust mask, cause' glass powder isn't good for the lungs. Eye protection is always a good shot too!
Step 1: Pick a Bottle
Pick a bottle that you would deem fit for an incense burner. Get a Dremel tool (if you don't already have one) and a cheap box of diamond chip bits from a flea market or some cheapo store.
Check this size bit. I choose this shape to go in at a slight angle so it is more like you are digging out the glass
rather than wildly spinning through it like on a drill press or the like.