If you haven't seen the Courtney Davis celtic tshirts you may not know who she is. If you have, you probably own several, and already know to get this book. You may even have some and not realize it, many examples of her work are sold at Celtic fairs. The designs in the book are clear and good, can be used (with a little work with scizzors, transfer pencils and plastic sheets) for either stencil, embroidery, a background for the paint-on stained glass decals, or scanned in for any purpose you would like.
It's definitely a book to buy if you are building your celtic crafts collection.