I keep my 24 x 36 on my cutting table, my 12 x 18 on the "drawer" of my sewing cabinet for those small trimmings, my 5 1/2 x7 1/2 is also in that pull out "drawer" My 40 x 60 is behind my china cabinet in the dining room, I don't use that one very much any more, too much trouble to clear off dining room table to use that big thing. I also have one that is on a "lazy susan" type thing and that is in my cabinet, it is large enough to trim up 12" blocks.
The 24x36 is used constantly!!!