Everyone one seems really inpressed by generative fill. I have been using it more for removing things and have found the remove tool works better for that. In the image below I sellected an area on the stairs on the right and asked generative fill for a lizzard crawling down it. I got a leopard, I guess, with a dislocated hip climbing a tree. When it works it is magical but a lot of the time it seems to get a kick out of tormenting you.