(30 Oct 2015, 3:57 pm)Dan wrote I quite like what Brighton & Hove do on their upper-deck windscreens (see below). Perhaps some taglines like the ones on the 56 and 309/310 would have worked well.
It's the little details that make them stand out. Arriva had something similar not that long ago promoting the eco-friendly buses, it also tied in with "Frankenbus" which is used on timetables and promotional material.