Decorating ideas!

[ultimateairn.livejournal.com]

I realize this isn't an interior decorating community, but this edges more on the crafty side of decorating.

Long story short, I want to decorate a bus. I work at a camp and every year we have the following theme days: Renaissance Day, Frontier Day, Halloween, and Hawaiian Day. The bus driver is incredibly sweet and says it's okay for me to decorate the inside and outside of the bus.  Everything I use has to be removable and legal (meaning it can obstruct the view of the bus lights, mirrors, etc.).

So far I've had the following ideas:
1. Taping a decorated paper banner to the side of the bus that reads: Ye Olde NAME OF CAMP.
2. Drawing something Renaissance-y on the windows with window markers.

Our bus is tiny like this: http://www.soderholmbus.com/collins/images/ford_bantam_600.jpg .

Thanks!