Buses: The Inside Scoop and Outside Chance.

There's really a central question surrounding this one and it's simple Risk vs. Reward:  Does the revenue from advertising on your school buses justify the risk. 

Risk is the chance that the advertising on the inside of the bus while suffer the wrath of the public backlash and put the breaks on your program or that somebody reading that ad on the back of the bus isn't paying attention to the brake lights and now you have a much bigger problem.

Anybody that has talked to me about advertising in schools knows I'm not a fan of advertising to children in a "trapped environment."  That includes the insides of classrooms and school buses.  If they don't have a choice to leave the immediate surroundings then I don't think it's a good place to be putting advertisements. 

I don't like the locker wraps either.... too forced.  I don't like murals or mobiles either - blurs the line a bit too much for me. 

There's too much easy inventory out there to mess with the sticky stuff.  There's also two much more important groups your missing:  Parents and employees.   Most of the big companies have their own rules already in place about "advertising to children" and they are very strict.  Concentrate your efforts and focus on the parents and the employees.  There's good money in that and a lot less hassle.