Recently one of my clients announced that we were going to have "Drawer Day" at our appointment. She picked a few drawers that hadn't been touched in a while to clean out and organize.
This "theme" for our organizing session made it more fun, and helped us focus on some neglected spots for quick organizational wins. We've organized drawers in the kitchen, dining room, and master bedroom. We've also used "Drawer Day" as a break from our larger organizing projects, especially when working on papers.
This can also be a great project to start when you only have 15-30 minutes.