I stole my dh's 48" t-square - does a wonderful job cutting long borders
I've made a sandpaper board with 220 grit and cardboard to sign blocks or to draw my diagonals with.
styrofoam insulation board as a design wall
4x8 plywood table for a sewing/cutting/layout table
small plastic storage bins w/lids for projects
plastic drawer units for storing stuff in
baskets for scraps and holding quilting items that are used all the time.
Dang, I know there's more, I just can't think of it. As soon as I post, I'll go'll dang! LOL