Ok, I've seen these selling here and there on Etsy, and they are VERY easy to make. I have seen them billed as "sustainable" and "green" but I'm not so sure they are cause even if you use these you still need the freaking paper cup. If you were trully trying to be more conscious of resources you'd do waht Melissa does and bring your own travel cup from home. However, I think they are cute and they do save using the cardboard sleeve, so I guess that's something. I'm keeping the pirate one.