Go and visit Michael Jurogue Johnson.

While searching for information on building agility equipment, I ran across the site of this artist. Neat story, fun artwork. Enjoy!

And - here are some fun graphics found from one of Michael's links - they're free to use on your web-site - all that is required is a link back to Jelene's site. I love her drawing style. Explore the rest of her site for more fun stuff. She also has a blog!