I have loved Zentangle (ultra-fantastic doodling) since I first saw a book about it. When my daughter wanted to decorate her shoes, I knew just what pen (The Pigma Pen) to recommend. I showed her the Zentangle website, too. Zentangle Website. She went in her own direction, and I think the results are fantastic!
After decorating them, we sealed the shoes with Krylon Matte Acrylic Spray on to keep them from getting damaged, even though Pigma pens are permanent and water proof.