BootyShaker - the app uses your phones accelerometer and touch input to manipulate round object joggling as realistic as possible on any selected image. Features: Create new projects using pictures from your phone gallery or taken with your camera Add circle regions to the image Scale and rotate the image in the design window Run your project and make the marked circle regions wiggle by shaking the phone or by touching the screen. Set some advanced settings for your project: gravity, damping, weight, frequency Set overlapping circle regions to merge or overlay Save a project There are some similar apps out there, but it was developed without any influence of predecessors, which makes this app stand out from the rest: Objects react to actual gravity, not just the shake gesture. User friendly UI and easy editing Follow BootyShaker on facebook The app has a trial option which has almost all that you need: you can save up to three projects and add two shake objects. The trial is also ad supported, which you can get rid off for just 0.99$ Get the app from WP7 marketplace