I've been playing with Weavesilk some times - you can create some weird patterns with it. There is some use for it, but not by itself. I did not know about Artbreeder - thanks for the link. Since we are at it, have you done anything on Deep Dream? You have to sign up for it and be a active member for a while before you can create larger resolution images. They would still not be poster-size, but with some of them I had luck playing in Photoshop with filters, mirroring etc - getting large enough results I could use as patterns on T-Shrts for example.
Here is a particularly good example from a photo of myself in Hawaii, over 20 years ago.

if you check it out in Steempeak, you can zoom into it (right-click and open in new tab).