The Creative Grids ruler was designed by Krista Moser, there are 2 sizes, I have both. She has a website
www.kristamosier.com where you will find her patterns and rulers for purchase. You can find tutorials by her on YouTube and at Fat Quarter Shop. I just finished Entangled Sky pattern and have Semaphore Stripes ready to start. Also be sure to check out her blog and tutorials on her website.