I am boring when it comes to color. Expecially something out in the sun most of the time...... so I would say red, blue or even orange. But white and other light colors will look dirty quick and bright colors will fade quickly. My FIL is all about tractors, he used to be Ford blue but now is Kabota Orange focused. They sell the paints for them and they are pretty durable. Or you could even go Harley themed if that is a thing your into. Maybe for some bling you can trim with some diamond plating.