Why do you think there is no black or white telletubbies?

Psychologists and marketers do things to please mothers/customers first and kids second.
Bright colors are thought to be more stimulating than black and white.
Kids make associations that bright colors are an invitation to play and infer that telletubbies are in their domain.
Colors are a neutral or inoffensive way to bring visual appeal, suggestions, and "action" into the show.
Playing with color is a viable way to learn about the world and about nature.
Color can be a chemical or physical property of light, matter, and minerals.

The teletubbies have no race.... They're f*cking teletubbies. They're not even human.

They are all colured