After I made my sewing machine pocket organizer, I got to work on a chair organizer – a very handy item that drapes over the seat of the chair so you have pockets on both sides of the chair (from McCalls’s pattern M4274, now discontinued). But it’s made for a traditional chair with four legs. There are two ties that hold it in place to the chair back. If you have a different chair I suppose you could leave the ties off and it could still work if you use safety pins to attach it to the seat cushion. Or if you have enough things in the pockets to weight it down, it could just stay in place by itself.
As you can see, I stuck a variety of things in it – pinking scissors (a birthday present from my older sister), extra pair of fabric-cutting scissors, boxes of pins, bobbins, and so on. It’s quite handy.
Simplicity also makes a pattern (3776) for fat quarter sewing accessories that’s still in print (at least as of this writing). It doesn’t have a chair organizer but it has a project organizer and other things you can make to hold your sewing items.