My first trainer was a PT40. It had Cub yellow on the fin and rudder, the top of the horizontal stab and elevator, The top of the wing, and the top of the fuselage. It had a darkish red (forget the exact shade) on all the lower surfaces. There was a black stripe hiding the color separation line.
I called it the Flying Hot Dog, or The Winged Weenie. I found it easy to maintain orientation. I'm currently building a PT60 (15 year hiatus from the hobby) and thinking about repeating that color scheme. I may call it WW2!