I work for a company that has been in existence for decades and has a lot of computers for the offices staff, engineers, etc. Almost everyone has access to at least one computer. As such, there have been a multitude of storage requirements for floppy disc storage through the years. Now that everything is on servers, the cabinets previously used for housing the discs are no longer needed. As old equipment is retired, employees are given the opportunity to purchase or are given this old equipment.
I was able to bring home a cabinet that used to house 3.5" discs. Since the company kept "history" discs we had to have large cabinets to store them. This cabinet has two pull out drawers. The upper drawer still had the boxes that the discs were stored in. These are perfect for for the Hemmingworth threads that we own and they would hold taller cones. I have labeled them by color and group them in the boxes. This is helpful for David since his partial color-blindness can be an issue for him when choosing thread colors.
The lower drawer holds a selection of our larger cones and spools. This cabinet was originally designed to be stack-able and is sturdy. I am able to put more thread cases or other items on top. This maximizes my storage area. You might be able to prowl the thrift stores or used office supply resale stores to find your own.
I would love to hear what you have re-purposed for your studio.