Ingenious Aromaglow floating oil burner disks.

Something completely non-electronic for a change, although it does involve fire and light.
These little plastic disks have been around for a very long time with no obvious changes. Probably because it's hard to improve on perfection. These things let you turn an ordinary glass into a candle that burns standard vegetable oil. They run for a very long time on each wick. Spare wicks are readily available or can be improvised.

Here's a UK eBay search for floating oil candles (note that some listings are just for the wicks and not the floats.)
http://www.ebay.co.uk/sch/i.html?_from=R40&_sacat=0&LH_BIN=1&_nkw=floating+oil+candle&_sop=15

And here's a search link for eBay.com for floating oil candles.
http://www.ebay.com/sch/i.html?_from=R40&_sacat=0&LH_BIN=1&_nkw=floating+oil+candles&_sop=15

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