From Vamp and Tramp, one of my favorite book artists is Paul Johnson whose lovely books are influenced by medieval book of hours:
http://www.vampandtramp.com/finepress/j/paul-johnson.html
Take a look at "The Chair Book", "Goldilocks and the Three Little Pigs" and other little delights (many of which I own and will not give away) which are colorful, sculptural and worthy of any hard-core bibliophile! And, if you love these little gems, Paul Johnson has written many books for the teaching of book arts which will show you how to make them!
Here's another one of my favorites:
http://www.vampandtramp.com/finepress/a/austin-red-L.jpg
"Red, Yellow, Blue" by Alice Austin is a lovely little sculptural book using a traditional lotus blossom fold to create a great little volume that will satisfy any printmaker, colorist and bibliophile on your list!
Check out another published book by artist, Nava Atlas whose original artist book led to this divine read!
http://www.vampandtramp.com/finepress/a/amberwood-Dear-guide-L.jpg
This book is for those female writers on your list who enjoy reading about those inspirational predecessors and mentors!
And, as always, if you don't know what to get, peruse Vamp and Tramp's website for some more great gift ideas or give them a call and they'll be happy to recommend something for that hard-to-shop-for person in your price range! Here is the contact info:
(205) 824-2300 or at info@vampandtramp.com
Happy Holiday Shopping!