Coloring Pages & Books: Castles published today (Saturday). My other coloring pages lens, Coloring Pages & Books: Ireland, published about two weeks ago, has been doing fairly well, having move up well into the second tier of lensranking (2,001 to 10,000). It appears coloring pages lenses do pretty well. Other lensmasters have coloring page lenses up in the top tiers so it's incentive for me to create more coloring pages lenses. The tricky part is finding a subject that hasn't been covered or at least hasn't been covered well.
Originally I thought I'd be doing a coloring page lens on Scotland, and Scotland has some castles. That led me to look up castle coloring pages and there seemed to be enough for a lens in itself, so I put the Scotland lens off for a while.
I looked up a lot of castle coloring pages on the Internet and found about a dozen. Putting them all into one module as links was one of the easier parts of making the lens. I also found four Dover Publications coloring books on Amazon. Adding them took more time as I had to write blurbs for them and the lens template I used still has some old coding that had to be modified.
Some of the reviews for the books indicated using colored pencils instead of crayons might be a good way to use the books, so I added one of Crayola's offerings to the lens along with the crayon and washable markers modules copied over from the Ireland lens.
I haven't done any coloring myself since a brief time in the '70s, but at least that experience told me it's not just for kids. Quite a few of the reviewers for the Dover books on Amazon indicated they enjoyed it and recommended it for older kids and adults even though three of the four books gave an age range of four to eight and the other range was nine to twelve.