There are so many coffee cup cozies on Etsy! I found that out when I decided to make my own and wanted to compare my design ideas with what was already out there. My take? I decided to dive into my stash and use special vintage, designer, and imported Japanese fabrics for mine. They're pretty simple. I use mine all the time, it's like a little home comfort when you're out and about.
Go ahead and share links to your own cozies, please write a brief description so people will be tempted to follow your links. :)