Read original post at Blaise Alicki's Blog
The concept is pretty simple, show a preview of the raw camera feed on the left, show a filtered view in real-time on the right. Have a list of filters to choose from on the bottom. Put some options on the side bar. Use the hardware camera button built into every Windows Phone (great feature btw) to snap the picture and save it to the image library so it can easily be shared using the social services built into Windows Phone (also a great feature).