I do a lot of machine applique so I have nearly every color known to man. I went to the sporting goods dept at Wal-Mart and got the flat tackle boxes that have dividers. I threw away the dividers and just use the boxes. I have separated my threads by color, then arranged them from light to dark. It makes choosing the right color easier if I'm sewing at night or a cloudy day. My threads are always dust free and contained.
I was lucky enough to get a new sewing room last year. My island cabinet that holds my machine has a door next to where I sit. You open the door and it has 7 pull out shelves that each accommodate 2 of the tackle boxes. They are arranged by rainbow. ROYGBIP
reds, oranges, yellows, greens, blues, indigos, purples,basics.
I know it sounds like I'm anal about order but after working at Wal-Mart nearly 30 years and having a military hubby, I have found that I spend a lot more time sewing instead of looking for things when it is kept in a somewhat strict order.