We're not sure what kind of mood these candles will elicit from your significant other, but the Mathmos Thaw Light lets you create a wall of ice around what would otherwise be a very boring-looking candle. It's essentially a mold that you can fill with water, freeze, and then pop a candle into. As the candle burns, the melted ice flows right back into the mold.

Firebox Mathmos Thaw Light