I purchased a 6 tier cart on rollers and have labeled the drawers by colors --I keep all of my machine needles in the top drawer along with a needle chart. The white and off-white threads along with the black and greys are kept together; yellows, golds and browns; reds, oranges and pinks; blues, purples and greens. Works great for me. My bobbins are kept in a round, doughnut type thing that came from the dollar store. It has 5 "doughnuts" and each has 5 compartment. I have 3 machines and it works well -- 2 for each of the more used ones and 1 for the extra machine.