I just read the whole thread, which I usually don't do! I have used old spools of thread, along with other small and misc. memorabilia such as thimbles and old buttons in an antique printer's tray which decorates my quilting room (read basement!) That's the little spools. The big ones are in an old wooden painted coke box. hum- I'll see if I can take a photo to share. Have been having some trouble with that, but mayb DH can help.
I do know that the lady at the LQS says thread should be kept covered, but I decided to ignore her for artistic reasons. If I were a more serious quilter, I would probably put it all in a covered container as recommended!