So I finally found the best way to describe this. Petopia has a page that has all the skins listed of a variety. That way when I'm creating my "Charts" I can make sure I have all types of skins.
Then I was also hoping for a Chart that might show Skins compared to the Pets that have them:
This would allow avid pet collectors the ability to search the skins they want and find the pets that have certain abilities compared to other pets.