I haven't seen any ready-made packages with prehistoric art... either from the caves in the Pyrennees or rock walls in Africa and America. However, there are certainly plenty of references in the images section of Google: "lascaux" produces 7000 hits, and it is just one cave. Find some bison or horses or deer images that you like, save them as selections, and in PhotoShop put them on layers so that you can resize or move them around. You will need to adjust contrast and/or saturation if you want the look of fresh paint. Play with blending modes (multiply might give you the look you want). Note that while the original art is certainly out of copyright, some recent photography of it might be protected. Best to go with government and educational websites and sources. When I was at Epcot almost a decade ago checking on some of my art there, I noticed a virtual reality exhibit of some of the caverns at lascaux. Since almost all of the caves are closed to the public, it was interesting to be able to walk up to a wall or peer around a corner with more of a sense of presence than an image in a book. Carolly