iOS App that is completely horizontal?

I am working on a 4 screens (pages) small iPhone App (not supporting iPad at this time). This is a photo centric app and ideally all images are captured/displayed in the landscape mode. Given the portrait display is not ideal and rotating devices around is not fun. I am hoping that we could design this app completely in lanscape mode. However, I have not yet seen any app like that. I wonder if you could give me some suggestions on that, point me to any examples. Thank you very much!