When posting about Fluids a commenter pointed me towards FireWorks, and what a great discovery!
The app created a spectacular show right on your phone, both in lights and in sound. The version currently seems to have moved on a lot from the version reviewed by 1800Pocketpc.com, with the current version of the software including several games which increases the longevity and fun factor of this free, ad-supported application exponentially.
As it is free I suggest everyone pop over to Marketplace and try it out. The link is here.