The Manything app and service is an interesting option for putting an old iOS device to work. It works as a time-lapse or surveillance camera, complete with motion and sound detection, along with online monitoring of the captured video. Right now, the service is free. (That certainly won't last long.) Who's Using Manything shows what's possible. If you have a tripod or other mount to set up your device, just plug it in (for longer life) and let 'er rip.