How To Easily Cut The Bottom Off A Wine Bottle -- (I would try this outside first. Don't know if there are any small fractures in the bottle when the 2 pieces split in the cold water. Interesting idea and definitely worth a try.
19 Diy Wine Bottle crafts: make art from emptiness
DIY wine bottle candle holders - buy round pre cut pine wood base from Bunnings and paint. Cut bottom off wine bottle using string dipped in alcohol to wrap around bottom, light and then plunge into cold water.