Updated 2015: a trimmed and updated list of colouring websites covering lots of topics and all freely available to download or print. Please feel free to send in suggestions.
Coloring.WS from DLTK – colouring sheets grouped by topic and event.
Coloring Book – sheets to print and colour from famous series and films, including Disney.
Activity Village – loads of sheets from all topics, subjects and events.
Educational Colouring Pages – scroll past the gendered, Barbie and Disney ones and there are plenty of pages that are less branded and more appealing – animals, nature, fantasy creatures and special events all figure.
Crayola – this site has been going since MuddlePuddle started! Plenty of themed, educational and fun free colouring pages here.
DLTK Colouring pages – Enormous list of religious, non religious and topic colouring pages.
Rainbows – Just what they say – but lots of them and really nice!
Nite Owl – Nursery rhyme pages to colour, often with words included, to bring something new to your favourites.