Granola Shirts Specializes in Custom Screen Printed T-shirts, sweatshirts, polos, hoodies and lots of other apparel. Best Prices Guaranteed. Call now for a free quick quote on your custom t-shirt project. We can use art you already have or create something for you from scratch. If you are more of a do it yourself kinda person then you will love our online design studio. Granola Shirts online t-shirt design studio was launched to provide a creative space where you can design your own apparel. We believe that everyone has at least a little 'artist' in them. With a bit of help from our online design studio anyone can become the master of their own creation. For over 15 years we have been supplying the world with quality custom apparel. Proudly located in Tulsa, OK, our team of graphic artists, master printers and sales associates, live to make sure your T-shirt experience is all it can be. It's your vision, it's our job to make sure the shirt on your back matches that vision. So, whether you are creating a T-shirt for your school, church, business or even starting your own clothing line, we are happy you're here.