I never really liked Frankie Muniz. He's too old to be Drake by now, anyway. And, if Nolan or anyone got around to doing these characters, you know they'd do the first ones.
Especially since Schumacher screwed them up before. (Barbara
Wilson? Alfred's niece? Robin = A Red Nightwing costume? C'mon...)
I like the 1990's style Robin most. The first comic I read with him in it was the Bloodlines series, with the origin of Razer. Couldn't find an image from that, but something like this:
Batgirl's negotiable. I'm not sure how much color Nolan or someone doing Nolan's style would put into these characters. I didn't like Schumacher darkening Robin before. Anyway, we'd probably get something similar to Batman's outfit:
What I would do though is make the Bat symbol black like Batman's, but keep the inside of the cape yellow.
I wouldn't do the short cape like the animated series. That's just not functional.
I really, really hope they at least do Robin though. Hands down my favorite DC character.