How do you randomize rotation on custom grid???

Hi all,

I'm trying to randomize the rotation pattern on a custom shaped grid that responds to an attractor curve.

ScreenHunter_07%20Apr.%2008%2017.06.jpg

Currently, Im having difficulty finding a way to randomize the rotation parameter of the cetroids of each custom geometry affected by the attractor.

For custom geometry patterns, is there a way to generate more than one component?  In other words, can you also randomize the custom geometry to be affected by the attractor?

Many thanks,

AB