Modifications on BMW's is fairly common. The 3 series forum has a LOT Of cars modified in various ways...
I have plans for my X3... not to make it "pimp", just to make it different from every other X3 out there. I've posted pics
here and will be using it as an update thread for every mod that I do on the car. I plan to have it lowered, rims and a few other things.
I'll be modifying mine to the similar style of my last BMW:
There are quite of few others running different rims already. You'll see the thread
here