What the X5 really needs isn't a better looking rear wiper, it needs a better functioning rear wiper. The length of the current wiper can't be changed or else you are going to destroy the 3rd rear brake light. If you could find a wiper on mounted on a cam or something similar that changes length, then you'd really have something. So that it's at its shortest length when pointing straight up (and not hitting the 3rd rear brake light) and at its longest length when perpendicular to that point so that it effectively covers maximum area.

Also, the spray is IMHO a disaster and I wish it would actually spray and not pee/dribble on the back window, though I honestly don't know how well that would work at speed.