I've seen a lot of coloring books for adults at bookstores recently, but I haven't succumbed to the temptation. Yet. Now it looks like Mills & Boon is coming out with just such a thing in May of this year based on the art in The Art of Romance and sharing the same title. I have the non-coloring book edition and have really enjoyed the historical aspect of cover art for M&B. While all of the covers may not be included, I hope the ones below make it in there.
Kind of makes me want to break out a brand new ginormous box of Crayola crayons in all their 64 technicolor majesty with a built-in sharpener and channel my inner five-year old. You can read all about the coloring book here.