I had a couple stem broken wine glasses. Use dollar store stemware or repurpose broken stemware. put glass down in plant and place a candle inside, use a citronella to keep bugs away or battery operated of children are around.
DIY Water & Oil Candle - uses floating candle wicks. Just add water & pebbles, float a layer of cooking oil and add floating wick. The site sells these wicks, but you can find them at Hobby Lobby and other craft stores as well.