If you act quickly you can snag a copy of Real Fireworks HD for the iPad for free instead of the usual US $4.99. The app creates very realistic or fanciful fireworks on your iPad screen, and has creative modes for fireworks that respond to your fingers and swipe motions.
The app has 7 preset modes, and color options as well as TV- out support. It might be perfect displaying on the Apple TV. You can set the size of the particles, the falling speed (gravity), and you have some control of the sounds.
I tried the app this morning and found the displays realistic, or as customized as I could have wanted. The animation is smooth, and you can export still images to your camera roll or share them with friends. It might b