Big Fan of RadLab
And as soon as I saw the creators had made a mobile app I was all over it. Used it a fair amount now and I love the filter effects. Love that you can create recipes and it remembers the last recipes you used to use in future edits. However I have had the app crash on my a number of times now and have sent "reports" of all those crashes so hopefully an update with bug fixes is in the works.
Cross21 about
PicTapGo - Photo Editor, v1.0.1