When I was a kid there were cheap fireworks which I believe used a similar chemical. It was amazing to watch them grow.
Most of these (at least now) are made of sugar and baking soda. They used to be made of mercury thiocyanate back when we didn't know mercury poisoning was trouble.
http://www.youtube.com/watch?v=F3aAksyabes#t=0m15s
I loved them too.
If you haven't watched the video yet, do it now. Some cool juju.