Let's Mix It Up

I've been thinking about my interaction. I like the fact that the fairies change once they're released but I think the clicking and dragging interaction is predictable. I would like the fairies to change manner depending on where the mouse is. I think this will mean that it takes longer for someone to work out all of the things that my mouse toy can do.
http://www.openprocessing.org/sketch/5974
I browsed open processing and found this sketch. I think this sketch has such a fun interaction because of all the different ways that you can interact.

I'm thinking of having the colour/opacity change depending on which quarter of the screen the mouse is on. And the movement change depending on how close the mouse is to the centre.

Right now when drawing the net I have added a random number that changes the size of the net this was to take away some control from the user. After testing I have found this to be annoying rather than innovative.