Great boxes and containers are perfect for a multi-use space because they give you a place to put thing that need to be kept safe and clean, but it's alright if they do not fit in the closet because they add to the decor of the room. I love these boxes so much that I would keep them out even if they were empty (ha! that would never happen!).
Some other great places to look for containers that are both functional and attractive include The Container Store and Hobby Lobby.
Organizing tip number two is a bit more crafty. If you are anything like me you have a bunch of little items floating around your workspace (paper clips, pushpins, beads, bobbins, safety pins, the list goes on and on...). Here is an idea for corralling all of those items, and recycling. I love flavored coffee, so I had piles of these containers: