I started to make a particle editor a few days ago and that is what I've done so far. Credits goes also to Tulamide, who helped to improve my code.
I will add more options to it later <img src="smileys/smiley1.gif" border="0" align="middle">
The "move with mouse" thing is only an experimental thing. Try it out and have fun with it <img src="smileys/smiley36.gif" border="0" align="middle">
<img src="http://dl.dropbox.com/u/26932498/spriter.jpg" border="0">
http://dl.dropbox.com/u/26932498/spriter.rar