algorithmic modeling for Rhino
Well this example is not using a point attractor but rather a curve. http://www.youtube.com/watch?v=-J-gva_e9kA
i dont know if you have seen it yet. but it shows towards the end of the video that what ever circles are closest to the curve they get larger. Maybe you can use this technique and try it for your own excersise.
Ha! just noticed this post was almost a year old.. Im sure by now you figured it out.