I found a great container to hold my Aurifil Wool collection at JoAnn Fabrics the other day. It’s the Deep Utility Box (Item 2-3730) by Creative Options. It was around $14.99 from what I remember, and I used a 40% coupon of course to bring that down a little. The little dividers are adjustable, so I can move them around when I add more colors to my collection! (which I will)
Of course the Aurifil cotton spools would fit in there too .. but I keep those in one of the drawers in my sewing cabinet.