A good way to use old mugs or even punch cups is to set a few cups on a tray, each one containing store bought votives (normally it takes two). Set the tray in the oven on 250 degrees F and let the candles melt. Remove one of the wicks and leave the other one. As the candle begins to cool, straighten the wick up into the center.
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I recently was gifted with a few bottles of Dala glass glaze. Some time ago, I received a white mug that was used as the gift box for a small gift. I wanted to do something with the mug. There was nothing wrong with the mug, except that it was white. I decided to turn the mug into a nifty candle holder using the glaze.