A particle system and gravity simulator. This is further improved, not a double repost.
You MUST read the help page before rating this!
DO NOT give a low rating just because you can't understand it.
Enter the following settings in for a good example:
First click on gravity vortexes
Check all the boxes
set the top X to 180, set the bottom X to 510
set the top Y to 200, set the bottom Y to 410
leave the rest of the settings the way they first were.
Next click the particle system button
the settings there should bet set already to this:
Follow Mouse: (checked)
Colors: Random : (checked)
X speed: 3
Y speed: -3
X position: (n/a)
Y position: (n/a)
Fade Speed: 0.01
Number of Particles: 1000
Gravity: 0 to 1
Next, just click the green start button, and move the mouse around the screen.