Particle effects, usually made by code.
snowfall that gets added to the ground
I wrote this for a website I'm working on. This is simple bubble maker. You need TweenMax to use it. Google it for TweenMax a ...
bubble mouse trail
fractal mouse trail with stars
My second submitted as3 file, this is an adaptation of the file found at http://goo.gl/8ac5Y, to allow for wind from both dir ...
The application draws randomly hued random curves focussing at mousecursor or random points. The curves fade out with time.