This is my current WIP.
It started out with just the batmobile from the 1989 Batman movie but it just didn't seem right to just render it out with a plain studio backdrop so I started working on the cave. The cave is my version of the batcave using movies, comics and games as references.
I still have lots to do but I'm open to ideas so that the end result will be better.
Here's a link to my WIP thread if you want to view my progress:
http://www.blenderartists.org/forum/showthread.php?343289-The-Batmobile