Instagram is one of my favourite apps with its ability to add a layer of faux retro-ness to your photos. Camera C64 takes it to the next level. The iPhone app modifies your photos to the resolution and colour depth of graphics on the Commodore C64 with its VIC-II video chip! The app is free though there is an optional (and very cheap) in-app purchase for extra colour filters for green, amber and B&W monitors. They were easily worth 69p to be honest! An example photo is below. Interestingly since i installed this app i have found there is another similar app too.
All very nice, though i never had a C64, i did have a VIC-20 though and still have a C16 somewhere... Here is a photo i took yesterday (of the canal natch).