I've always said that Alishe would be played by Audrey Tautou. It still holds true even now.
Mind you, she's a hell of a lot shorter than Alishe. Not to mention she's missing the blueish skin and long ears, but meh. The essence is there.
Aieryn would be played by Evan Rachel Woods. Don't ask me why, she just would.
Muirene would be played by Erin Cummings. Yes, she will kick your ass and look good while doing it.
Again, you'd have to make her a Kaldorei, but she's got the right stance and vibe.
Though if Feliche's nickname for Muirene was followed, she'd be played by this lady: