I had this idea a little while ago: what were to happen if the Back to the Future gang left some of their tracks behind, not necessarily destroying the space/time continuum but also not making completely sure to not leave any loose ends left untied.
This scenario doesn't fit into the BTTF fiction (per se): this is more the direction the writers might go if they ever made a (high quality) animated TV show (fingers halfway crossed). I wanted to go for a cave drawing/painting, so I figured a torch illuminating the mural would be a good effect. Hey, I even got to work an 'Indiana Jones' type protagonist in there.
I don't know if this has been done (or printed) yet, but even so, I had great fun doing this one.
Let me know what you guys think!