While reading Raise the Dawn, I had an idea for whom to cast as Gell Kamemor, the Romulan Praetor. Before, I'd been imagining her as an elderly matron, maybe a Judi Dench type, but the book described her as relatively younger, middle-aged but still with black hair. And something about the way she was described in a particular scene, the way she reacted to an upsetting situation with calm and poise, reminded me very much of Olivia Williams's performance as Adele DeWitt in Dollhouse. And Williams's shorter hairstyle in season 2 of that series did look a bit Romulan. Maybe she's a bit young for the part, but otherwise I think she's a good choice.
This is a really good call, actually. I hadn't imagined her that way, but when you mention it, I can totally see it.