Here's a weird technique. If you've ever made loopy fabric by using your thumb to hold some extra yarn out while you make your stitch, then you can do this. It's all made with single crochet, but with three strands of yarn held together. When making the loops ONLY hold out one yarn. In this case, I used the yellow fluffy yarn every single time, but for an interesting effect, you could pull out a different yarn for each stitch.