On two small wall hanginging I made for my aunts this past Christmas I used the printable iron on fabric sheets and pressed it onto the back before quilting, making sure the to catch the ends of the lable into the quilting. The other way for my neighbors quilt, I used the permanent fabric marker and wrote it in one of the lower corners of the quilt.

I did a google search and found these sites to print quilt labels.
http://www.graphicgarden.com/files16...t/labels1e.php
http://h10025.www1.hp.com/ewfrf/wc/acCategory?lc=en&cc=us&dlc=en&extcat=Quilting
http://www.victorianaquiltdesigns.co...uiltlabels.htm
Hope this helps

You all should take note, that at the bottom of each page, links are provided to vendors that supply that particular topic. At the bottom of this page for example are links to places to purchase quilt labels. I also buy quilt label panels when I see them. The smaller ones look really neat inside of quilted jackets and purses. Some of my panels have never been used, but I have them, so I figure I am ahead of the game. :lol:

As far as I know, they just used India ink. I used to have lots of antique quilts and the signatures would fade to a brownish-black, so whatever it was, it had some iron in, as well as pigment.