A variation on that I've run across, which imo works better on mobile, is to keep a gallery, but instead of displaying it directly as a gallery, have a button in the app where you can load a random creation from the gallery "live" into the app, and then use it as a starting point to edit. An app some friends of mine made, Sketch-a-Bit, uses that in a way that I think works pretty well: http://sketchabit.adamsmith.as/