I found these cute pencil holders from Target and they make the most perfect brush holders. They are made from recycled paper and were around $3 from the "Green Room" collection. I have mine split up...the one of the left is all face brushes and the one on the right is all eye brushes. It really has made things a lot simpler for me because I don't have to go searching for what I need. I'm thinking about getting one more and spiting them up even more.... maybe one just for my blush brushes.
You can find these cups down the office organization aisle.