Putting a Face to Your Characters

As I'm writing, I get a general idea for how the characters will look in my head. I don't usually have a perfectly clear idea of their face in my head as I'm writing, just usually characteristics, like the protag has long, brown hair and blue eyes. I've become inspired by this extensive thread on the Absolute Write forums. It's page after page of character inspiration photos, and I have to admit that after spending a good two hours looking at everyone's inspirational photos, I made my own.

Sure, I can't help but daydream that my novel would be turned into a television show or a movie and I could get the actors in my inspiration photos to star in it. That said, for me that's not really the principle behind the exercise. I think it's fun to look through photos to get a better idea of what my character would look like if they were a real person and not a figment of my imagination. It took me about four hours to fill out my character list, but once I did, I felt such a surge of inspiration that I sat down and wrote for a good two hours. I'll be sharing my character inspiration boards once things settle down for me a bit, but this brings me to my question:

As you're writing, do you have a clear vision of your characters in your head? If not, do you create character lists for your novels?