I make my labels as a slide in Power Point because it is easy to use and is pretty versatile. I insert a photograph of the finished quilt, add materials, size, technique info, an artists statement, and contact info for me. I print the slide on a fabric sheet that is then added as the back label. I've saved the slide for the "Winter's Veil" label as a .jpeg to show here.
The extra advantage of having done this is that the label slide becomes a permanent record of my quilt. It makes it easy to answer questions about upcoming exhibition needs for space, etc.