What image generation techniques could you suggest for a DApp game that utilizes ERC721? I know that CrypoKitties has a unique DNA sequence and different pieces of the sequence correspond to the different pieces of an image. Are there any other possibilities? Specifically, I am interested in the generation of a basketball player image. I am thinking if there is a way to implement this using a generative neural network or something more advanced so that the images will look could and the game will be as less centralized as possible.