Choosing colours for colour blocking involves a blend of science and artistic intuition. Start by understanding colour theory – how colours interact and their psychological effects. Go for contrasts like red and green or blue and orange to create dynamic energy. 

Experimenting with tertiary colours, which blend primary and secondary colours, offers a nuanced approach, providing a rich visual experience. 

Whether you're designing colour block wall designs for interiors or exploring colour block living room ideas, understanding these principles helps in creating spaces that not only look vibrant but also evoke specific emotional responses.