I had twice as many of these printed as CDs made. The CD sold out, and now I have a whole load of these left over. To encourage people to buy them and colour them in, I started doing it myself figuring out that if I did that people would see how nice they could look in full colour. It took bloody ages to do two colours on each page. I am pondering whether to put books like this on Bandcamp tomorrow but I'm not sure yet!
I didn't in the end because it took so long to colour the pages! Here's a link to the book and download codes if you'd like to have a go yourself: https://helenmccookerybook.bandcamp.com/merch/the-sea-chord-lyrics-book-digital-album