craftgrrl | are eggshells flammable?

I have a bunch of stubs of big, wonderful candles (beeswax, mainly) that I've been planning to melt down and turn into votives. Last night I had an incredibly detailed and vivid dream in which I decided not to use a mold but ran wicks through holes in the bottoms of empty eggshells, broke off the tops and filled them with wax to make candles. In this dream I then found some very cool antique eggcups to use as candle holders.

Upon waking up, this still seemed like a good idea. Is it? Are eggshells highly flammable? Has anyone ever done this before? Is there any reason not to try it?