I use coffee filters as stabilizer when machine sewing appliques.
Baby food containers are good for many little things...they are rectangular boxes with lids.
I use the decorative boxes (like you see at Joanns or Michaels, Tuesday Morning, etc.) to store my WIPs and UFOs.
I also use paper tape to label them...I get paper tape in any drug store department that sells bandaids. It never leaves a sticky residue and comes off easily. I have it on my wood furniture too. I label the drawers that hold fabric, supplies, etc.