Android, Paper Camera app - Kitchen 1

I like this app! It has several different effects (some work better on some subjects and in different environments - and they all seem to work better without too much detail e.g. trees & bushes close up).  You can see what the effect will do in real time, and has sliders that let you modify contrast, brightness, and lines One drawback is that it limits the size to 1024 x 768.