Go here for ideas: http://www.loganberrybooks.com

You have a couple of Dr. Snyder's books: we'd add The Egypt Game and her first book, Season of Ponies (although it has a somewhat frustrating ending) for middle kids, and definitely for older kids/YA, the Green-sky series (and possibly the video game that came from it): http://en.wikipedia.org/wiki/Below_the_Root

For younger kids:

* Karle Wilson Baker, The Garden of the Plynck.
* J.M. Barrie, Peter and Wendy.
* L. Frank Baum, The Wizard of Oz and all the followup books.
* Virginia Lee Burton, Mike Mulligan & His Steam Shovel.
* Lewis Carroll, Alice in Wonderland and Through the Looking Glass.
* Daniel Curley, Ann's Spring.
* Michael Estrin, Fun for a Rainy Day.
* Marjorie Flack, The Story About Ping.
* Wanda Gag, Millions of Cats.
* Nathaniel Hawthorne, Wonder-Book and Tanglewood Tales.
* Crockett Johnson, the Harold & the Purple Crayon books.
* Eleanor Frances Lattimore, Little Pear and many others.
* Yoko Ono, Grapefruit (to inspire imaginative art projects).
* Beatrix Potter's books.
* Esphyr Slobodkina, Caps For Sale.
* Hildegarde Swift, The Little Red Lighthouse and the Great Gray Bridge.
* J.R.R. Tolkien, Roverandom, Letters from Father Christmas and the poems in The Tolkien Reader.

For middle kids:

* Betty Brock, No Flying in the House.
* Walter R. Brooks' Freddie the Pig series.
* Thomas Bulfinch, Mythology (also published as The Age of Fable -- see if you can get a complete edition that has the Mabinogion in it).
* Mary Canty, The Green Gate.
* Walter de la Mare, The Three Mulla-Mulgars.
* Arnold Dobrin, Josephine's 'magination.
* Elizabeth Enright, Tatsinda, Zeee, Thimble Summer and the Melendy books.
* Eleanor Estes' books about the Moffats, and The Witch Family.
* Eleanor Farjeon -- all her books are beautiful.
* Rose Fyleman's poetry books.
* Paul Gallico, The Day Jean-Pierre Went Round the World and all the other Jean-Pierre books.
* Clifford B. Hicks, Alvin's Secret Code and all the other Alvin books.
* Gene Inyart, Tent Under the Spider Tree.
* Alexander Key, The Forgotten Door and Escape to Witch Mountain.
* E.L. Konigsburg -- all of them, really, but especially Jennifer, Hecate, Macbeth, William McKinley, and Me, Elizabeth
* Charles Lamb, Tales from Shakespeare.
* Andrew Lang's different colored Fairy Books.
* Eleanor Frances Lattimore, Felicia.
* Robert Paul Smith, How to Do Nothing with Nobody All Alone By Yourself.
* Margaret Sidney's books about the Peppers. A little preachy but not too bad.
* Marguerite Vance, Windows for Rosemary.

For older kids/ young adults:

* David Almond, Heaven Eyes and Skellig.
* Pamela Dean, the Secret Country series.
* Lois Duncan, A Gift of Magic.
* Edmund Hildick, The Active-Enzyme, Lemon-Freshened Junior High School Witch.
* Ursula K. LeGuin, the original Earthsea trilogy.
* Harper Lee, To Kill A Mockingbird.
* Norma Fox Mazer, Saturday, the Twelfth of October.
* Doris Orgel, A Certain Magic and The Devil in Vienna.
* Opal Whiteley, The Story of Opal.
* Oscar Wilde's fairy tales.

Go to Oyate (http://www.oyate.org/catalog/index.html) for children's books by and about Native American people.