I do embroidery also so I buy the Neb pre-filled bobbins. As I get down to the end of the bobbin I change them out during the sew out so it doesn't happen in the middle of the design. As I hand sew my labels to the back side of the quilts and they are usually white, I'll use the leftover thread to sew them on.
I've also found they are great to fill in that empty space inside the large spools of thread when you have it on a side thread spool. It keeps it from wobbling as it turns on the machine.