quantum_rebirthA useful abstract explosion / implosion in looped HD720 30fps format.
This clip would make a fantastic intro, composited on other footage as an effect, or rescaled and used as a Flash movieclip.
The preview above demonstrates the loop on a black and checker background to show you the transparency, but it works well composited on any background.
This clip is encoded as a Quicktime PNG with Alpha to allow quality re-encoding to other codecs.
Click here for a HD frame sample (on a white background).