As it is in keeping with my previous post check out what the Honda F1 (Formula one) racing team have done. Instead of having corporate sponsors all over their car as other teams ubiquitously have they have done something a little bit special.
http://www.myearthdream.com
They have a map of the world painted on the car made up of tiny pixels. Each pixel is in fact someone's name. You can get your name on the car of you go the the above website and make a pledge and donate some money to the myearthdream trust. It is at least worth looking at the pledges to see what one can do to reduce ones carbon footprint. Also there is a neat map thing on the site where you can see which pledges people have chosen from which countries.