You now have an online gallery of Persona skins to browse through, from the newest to most popular. You also have several categories of themes to choose from too. The best part of the site, is if you have the Personas change-around installed, it will change as you hover over each preview image.
My only beef with Personas now is the fact that it dims my tab bar so much, on most skins I have a hard time seeing the text on the tabs. Back to the web site though, GetPersonas.com also allows you to login and submit your own skins too. Let me know if you do in the comments, as I would really like to see some new interesting designs.