I bought a little book a long time ago that has different quilt labels that you color and fill in the information. I also have some that came from a yard of fabric that was full of labels. However, I have also done them through the computer, and then gone over the print with a pigma pen. I've also gotten clip art that I like and make a frame, add the text to the center, and usually print it out on paper. Then I use my light box to put it on fabric. I have used a variety of pigma pens, gel pens-gelli roll, and ones that are not metallic. I usually paint them with pigment ink, iron and then attach to the back of the quilt.
If it is an applique quilt I make a small flower, or animal and then put the writing on the fabric with it. Another possibility is to make one of the blocks, outline, miniaturize it then paint with pigma ink pens.