As you might already know my forthcoming iOS game, Toxin involves shooting rapidly dividing toxic cells which eventually fill the playfield or burst to spawn.
Creating good looking graphics for an abstract game like Toxin is harder than it first appears. Not only are your images stripped bare of most signifying.
August 2016 Update: AtlasMaker is now on Github: https://github.com/richardjdare/Atlasmaker In game development it is common to have hundreds if not thousands of texture maps and animation.