Eh, But Promising
Yes, it does what it says it does. And thats just about all it does. You have no control, and limited control means limited usefulness, especially to an artist. You definitely need to be able to control the areas that are flipped, and adding a variety of color controls would make it awesome, perhaps by adding some sort of numerical value to each square in the grid. Regardless of its current state, the developer seems enthused so Im hopeful for future updates. A native iPad version would also make it more appealing to us artist types.
Ladylonglocks about
FLIP - Remix your pics