I have the Orange one...
I have an Orange one, and as DotNina mentioned, it matches the Power Adapter ring when my Powerbook is charging.
I have faced one problem with the Starck though: sometimes, the mouse pointer goes crazy and jumps to some other part of the screen even though I didn't move the mouse. I have seen one other person on the Apple support forums who has the same problem (he has a Starck too). But this happens sufficiently rarely that it is no more than an occasional irritant.