Limit-Studios is offering Photoshare over at the Windows Phone Marketplace. Billed as the "photo sharing app", Photoshare allows you to take a photo, swap or share it, and recieve photos from other Photoshare users.
Photoshare automatically shares photos taken through the app and you can share photos from other Photo Gallery folders as well. At any time you can delete your shared photos through the About/Support menu (access through the three-dot menu).
Unfortunately there isn't a trial version available for Photoshare with the full version running $1.29. You can find Photoshare here (opens Zune) at the Marketplace.