I have a set of 256 spools, stored in boxes by color. the boxes I have are deep enough to have a 1/4" piece of plywood with dowels glued on (I made this wood insert) I wrote the color number on the dowel to make it easier to put away. I also numbered the rows of dowels, and wrote the row number on the spool. I then made an excel spreadsheet with the color number and row number so I could find the color easier. I also got the multi spool holder for my sewing machine so as I pull the spools, I just put them on the thread holder.