Fireplaces are cool. No arguing about that. Rainbows are also cool. What happens when we mix those elements? Awesome. That's what happens.
For merely 20 bucks you can have something like this in your own fireplace. unitednuclear.com offers a ready-to-use chemicals mix that will make your BBQ really extraordinary. Just add some alcohol, water, pour it on wood and - voila! now you can... well, don't know what you can do, but it's definitely awesome.
I wouldn't make s'mores on it, though.