I think Bottlecaps is a pretty good concept for a coin, although by its nature it seems like it should represent something of small value which can be quickly traded for everyday items (like a cup of coffee). That could certainly be a good niche for the coin to inhabit in the far off future alongside the more valuable resources of Bitcoin and Litecoin.
I personally prefer CAP as the short-name and I think you should definitely steer clear of infringing any IP with use of images etc. As long as the foundation is seen not to be infringing, noone can stop the public drawing parallels and making their own personal graphics etc. I dont think the concept of Caps could be seen as infringing in itself as it is an old concept which has been in general use around the world.
But please, dont let Digitalindustry anywhere near your foundation/Dev team. He seems to be a few spanners short of a toolbox.