I wrote a program which generates paintings (fine art), and not bad ones BTW. They are generated non-stop one by one. If you like one of them while watching the process, you can save it. Moreover, the resolution is 10'000x7'000 pix (70Mpix!).
Now I am guessing whether there can be a demand for such a program, and what would be a reasonable price for that. How much would you be ready to pay for it? Take a look at some sample pictures at www.sanbase.com/art