I also use pizza boxes for quilt blocks, I ask for them flat and fold the writing inside so they look nicer on the closet shelves. Other things in my sewing room:
Bulletin board for newspaper/magazine articles, name tag, future projects, etc.
Large Mug for holding pencils, machine oil & paper cutting scissors;
Plastic divided box for extra presser feet (I put felt squares in each; cushions feet and it easier to see contents;
My favorite pins from a florist, perfect length with plastic heads and have lasted for years;
Adhesive hooks to hold stencils on the side of my cabinet;
Tackle box tray for accessories; in sight under my Sew Steady table;
Bullet light by machine, hang tape measures and embroidery hoops, etc. on it;
Handled carry tub for quilting supplies;
Pieces of balloons for pulling needles when hand quilting.