Some candles are beautifully decorated (eg. Elemis royal candle), and once cleaned out, they'd be perfect as a make up brush holder. My Noble Isle candle came with it's own lid, and once I've finished burning it, I plan to put it to good use as a storage pot for cotton wool pads.
Smaller glass tumbers have come in incredibly handy too. My empty Apivita candle is the perfect size for housing all my hair clips, and I've got another glass tumbler on my desk which holds odds and ends such as superglue, name badges and elastic bands.
Do you have a favourite scented candle? What do you do with your empty candle glasses?