Hi, I am consistently being offered colouring pages etc with PLR rights etc, what is your thoughts on using these to make a book for Amazon KDP??

I would not use them without editing. If you want to do coloring books here are the options:

1. Use PLR and edit them so they are unique
2. Use AI to create them and then upscale the images, and then edit / add as needed.
3. Use our coloring page maker tool. We have 9,200+ coloring elements that were hand drawn by our illustrators and you can use them in any arrangeent as you like on a page and create unique layouts that way.

Best,
Corvin