i have created some particle type animated sprites. take a look at them here.
They can be dragged around the screen. There is also a white draggable box which shows how the sprite looks with a white background. Some of these are really only suited to darker backgrounds.
If there is any interest i will make them available for free.
Warning this page will take some time to load and i would suggest is not suitable for viewing from a mobile device. I would also suggest using chrome but it should work ok with other browsers.
Animated Particle Sprites
Here is the capx containing all the sprites shown above.
Depending on feedback here i will consider creating similar custom animated sprites.