Good idea for a bus advertisement?

doing an ad campaign for school to get people to "go green" and use the bus system to help. The key point is that the buses not only use biodiesel but to encourage people to GET on the bus instead of driving, there will be ipod hookups for each person, free wifi, and there will be a system of geting discount bus fares by turning in recyclables etc. (MIND YOU, this is a FAKE bus system, it does NOT exist yet, but we had to get creative and MAKE UP something). I'm really struggling on the advertisements for the bus, not ones ON a bus. We have to a do 2 ads that will go in a magazine to promote going green and riding the bus. (this is for an advance graphic design 1 cl). we also have to do a brochure, any ideas on the magazine ads??