Kids-n-fun.com is a site that has loads of colouring in and activities for kids. These are all free and include things like funky colouring pages, craft ideas and activities, and wallpapers. There are more than 3000 colouring pages on the site for you to save and print for free.
You can find colouring pages on almost every subject and theme and the handy search bar at the top of the screen will help you to narrow down your choices. You can print the image by choosing pring on the file menu of the browser, or you can right-click the image and click Print picture or save as.
They have 101 Dalmations pages, winter pages, Christmas, Easter, 64 Zoo Lane, and loads more. Although my daughter was gutted when we realised that there is a listing for Scooby Doo but that there are no free colouring in pages associated with it. AH well, she was satisfied with some Aladdin and Kung Fu Panda, so all is well.
Thanks to anandlau at HUKD!