There are many Dorling Kindersley books, full of color. E.g.
https://www.kobo.com/gb/en/ebook/the...-revolution-83 (the kobo store is horrible to search, it’s actually easier searching on the kindle store to see what’s available first). There are also many Delphi Classics Masters of Art books e.g.
https://www.delphiclassics.com/shop/albrecht-durer-2/. I enjoy looking at watercolors on the pastel colors of the Libra screen, although that is a personal preference seemingly shared by few.
There is also a very nice illustrated edition of the Hobbit and other JRR Tolkien books, with his original watercolors, this looks gorgeous on the Libra. I got these for $1.99 on Tolkein's birthday, as they (Amazon and Kobo) do a sale of all his works on that day each year.
ETA: There are many books incorporating color out there! And a lot of people saying there aren’t! For some reason.