I sometimes put the label in the bottom left hand corner (facing the back) after the quilting is done and before the binding is put on so it is enclosed into the binding on 2 sides. Before I put the binding on and before the label is put down on the quilt, I "frame the two sides not going to be enclosed in the binding so the whole label is surrounded by a frame of binding fabric (I just applique stitch the two free sides down). Sometimes I just turn under the 2 free sides (no frame).
Sometimes I use an extra block left over from the quilt top to create a label. And sometimes I put the label into the body of the back somewhere.
The important thing is to LABEL YOUR QUILTS!!!
Here are some pictures of labels I have used:
PX OF RECIPIENT - IN BODY OF QUILT BACK
[ATTACH=CONFIG]39233[/ATTACH]
MADE AN EXTRA BLOCK TO USE AS LABEL
[ATTACH=CONFIG]39234[/ATTACH]
BINDING FRAMED LABEL
[ATTACH=CONFIG]39235[/ATTACH]
SCRAPPY BINDING
[ATTACH=CONFIG]39236[/ATTACH]
PARTS OF EXTRA BLOCK
[ATTACH=CONFIG]39320[/ATTACH]