I have 2 of the really large (maybe 60 spools) thread boards - the kind that can stand on a table or be hung on the wall. I hung them one under the other on my wall and have my thread arranged by color. But, the spaces between the pegs that the spools sit on are not quite wide enough to accommodate the thread spool bases, so I stagger the spools, on top side up, one top side down, etc.