Learn from Weinergate. This service creates a password-protected vault for sensitive photos. You can view them as a slide show, or email to yourself to store elsewhere. The free version allows one folder with 10 pictures; upgrade for unlimited folders and pictures.
WIRED Files and notes are encrypted. Unassuming icon doesn't pique interest.
TIRED Doesn't hide video files. Putting photos in the app doesn't auto- delete them from your library.