Neato! Drawing prompts always make for lots of fun. My only real complaint on "Such Art" is how crummy the prompts are. Your cards & dice model adds a great tactile element to prompt selection over programmatic generation.
I see that this is set up so that it can be printed. That's a considerate touch. I can imagine this being a great compliment to things like art conventions. You could stack up hundreds of them with some tables and pencils and let visitors go nuts. But on the digital side of it, have you considered making a prompt + art tools all in one type of game? For example, consider GIMP. It's an excellent digital art application, it's open source, and the general usage license allows for modifying it to make and distribute your own version. You could take just the basic tools and canvas sections of GIMP's source code, plug a prompt generator into it, and wrap it up with a handy interface. I have occasionally wondered why nobody has done this yet, since both art prompts and art games have made themselves known to be mighty fun.