Most of my complaints are about how crummy a comic book character Harley Quinn is. On the other hand, the only time I've ever been remotely interested in her is this image I saw of a fan-made poster of her done up in the Nolan style.
Did a search and found these...
I think she looks a little too morbid.
Here's another version...
Those shots are from the same site
as the Catwoman pics I posted earlier. I find the red outfit especially impressive. It's a nice piece of semi casual-wear that captures the "Crazy Joker Fangirl" spirit of Harley Quinn without looking as dark as the pics above or too over-the-top cartoony. And I suspect that a Nolan version of the character could still include a straight-up jester outfit, but in the right context.