Can you recommend me a free iPad photo app?

My wife’s iPad is too old to get iPhoto for free, so we’re looking for something else. She wants to be able to edit photos and send them to a printing service (e.g., Shutterfly).

P.S. If you’d like to recommend printing services other than Shutterfly, she’d be open to that as well.
P.P.S. Suggestions to switch devices or any other sort of anti-Apple commentary will not be considered helpful.