Here's a simple colouring page of Leonardo da Vinci, perfect for younger kids. Maybe he's about to start painting the Mona Lisa?
Leonardo da Vinci Colouring Page
Here's a fun Andy Warhol colouring page for younger children - with one of his most famous portraits in the background!
Younger children can enjoy colouring in this simple picture of Thomas Edison holding a light bulb as an introduction to topic work on inventors perhaps?