I do the White fabric with the pellon underneath, ironed on, then put on the back of the quilt, then write my name, date completed, and pattern name. If there is anything unusual about the quilt I write that also.
Keepsake Quilting has beautiful labels with flowers, ect, on them. I have used them a lot.
Our guild has special labels we used on the quilts we make for Community quilts.
Mariah