When I did some covers for Tom Baker's first season of Doctor Who, I had the absurd and off-kilter idea of producing them as a series of World Distributors colouring and activity books - the sort that were very prevalent at the time. You can see them here.

Here they are - all tidied up. There's also a new version for Revenge of the Cybermen as the main pic in the old one was too bizarre even for a 70s novel cover...