Yeah, I haven't decided if I want to put the lambo nameplate, or just liberaly sprinkle the bulls around (sounds kind of appropriate) - I figure that the bull logo is not so well known so that anyone seeing it is just as likely to keep wondering what brand the car is anyway.

As for the web and graphics, I don't have a good link to send you to. It is just info that people pick up after a while or use in their daily work. I actually had a very small, teeny-tiny part in the creation of the png format back in the day, so all the docs I learned this stuff from are probably roadkill now. But I did do a google for you and after looking at a couple of dozen hits, this one looks like the best balance of detail and usefulness:

http://www.ee.surrey.ac.uk/FAQ/standards.html