Photos and picture editing
Editing digital photographs used to require a seriously powerful home computer, but nowadays you can tweak your snaps on a smartphone. Apps such as Adobe's free (and superb) Photoshop Express are now available for both Android and iPhone. Additionally, there are loads of superb add-on lenses, miniature tripods and other accessories available for your smartphone, for those camera-phone fans that want to squeeze the best possible photo from their mobile.
The iPhone SLR lens mount - for serious snappers who want to squeeze the best out of their iPhone
360 Panorama app for Android or iPhone - one of the coolest photo gimmicks for your phone
HalfTone for iPhone - cartoonify your life!