It's always good practice to keep a sketchbook with you everywhere you go. I've found that if I have it on me, there's no reason not to use it :)
Been experimenting a lot with loose shapes as starts to characters. I knock out a large shape with a marker and then use a fine tip pen for the line work. Nothing fancy, but gives me options to explore.
I'm not particularly fond of the Game of Thrones, but the costumes are pretty awesome. Here's a sample of a few quick & dirty sketches. Can you name any of the characters?
Playing around with dresses. These are mini sketches. Each is only about an inch tall.