Back in May, I was invited by my neighbors from Sprout Patterns to take a tour of the Spoonflower HQ, right next to where I live in North Carolina. If you don’t know Spoonflower yet, it is the leading company for on-demand printed fabric. Their website lets you pick a fabric quality and print your own design, or choose one in their gigantic design library. Sprout Patterns is one of the new services they offer, which launched last year. Its concept: combining the fabric printing capabilities of Spoonflower with a curated selection of indie patterns to offer customized sewing project…