The phrase "to colour the pages" means to add interest, meaning, or emotion to a written work or story, making it more lively and engaging. It is a way of bringing life and depth to the words on the page. Full definition
The «Play for Life» journal is published with over 100 A4 four colour pages in each year making it the largest international journal of play therapy practice. (playtherapy.org)
Included are both light and dark colour page options. (ikono.me)
If you want to enjoy some colouring with your family, click here to find an extensive collection of free colouring pages for kids. (momentsaday.com)