SpyPhoto is a modification that will allow you to take a photo using an Activator gesture, so you can get to take the photo very quickly and in a way that nobody notices, hence its name. You can use it to take photos quickly or to take spy photos, either way, do it at your own risk.
Configure its activation and if you want it to ask or not from the Settings of your iPhone, you can also configure it to use your front camera on iPhone 4 and iPod Touch 4G.
You can download it by $ 1,50 on Cydia.
You will find it in the BigBoss repo.
You need to have done the jailbreak.
Only photos ??