This idea came from another QB member at least a year or so ago. It may be in the archives but here's a quick detail....
Bobbin minders:
Made from clear flexible tubing....look in plumbing at Home Depot/Lowe's/etc.
Get a diameter that will fit over a full bobbin.
With a sharp craft knife or box cutter cut tubing into 1/4" slices, or just wide enough to fit the depth of the bobbin.
Cut each slice open so you have a little "C" shape.....since it's flexible it will fit over the thread on your bobbin.
Package up 5 or 10 of them in a cute little Christmas-y bag or box and you're all set.
What a great idea. I hate how there is always threads hanging out of my bobbin box!