Hi "Keep It Simple" :)
Like you I am not stuck on yellow cars or white cars either.
The military used yellow to depict it's training aircraft. If one went down it was much easier to spot than an all aluminum or camouflaged aircraft and when in the circuit they were easy to pick out.
When Piper produced the J3 Cub they were mostly all yellow as well. They were trainers and the yellow livery looked great on that aircraft.
Not sure why I do not like yellow or white cars but perhaps it is just each individuals taste...

Cheers...Happy Landings...Doug