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iPhoneography: Resources
My camera: Sometimes, I use it to make phone calls.
Resources for the Learning 2.013 workshop
We didn't have time to get into this, but if you use apps that support layers (such as Laminar, Blendr, Superimpose or Leonardo), you can add custom textures to your images to great effect.
Dan Marcolina's amazing app/book that reviews several apps, and shows the workflows for some of his photography. The link to is to the companion app for the book.
The Art of IPhone Photography by 
iPhone Obsessed by