Here's two sources for you to consider Nancy.
I looked on line at fake plastic rocks. They might work for you. You would have to make a cut out to cover your faucet. Home Depot sells them in different sizes, shapes and colors. They are also available on Amazon.
Hi ! I made came bricks using floral foam ... Maybe glue a few together then shape by cutting into it and hang it up making it look like a rock . Scoop out an area for the spigot and spray paint it rock color ...Good luck !