what a wonderful idea!
to preserve a beautiful candle, burn the wick enough to hollow out the center,
next time you need a li'l bit of ambiance, pop a votive in the crevice and voila! your treasured candle will last for ever and ever and ever and ever and...you get the idea.
note: before displaying ANY candle, burn the wick for a classier look (i know, what's so fuckin' classy about a burnt candle wick, but it just is, okay?)