The Giving Book Club, The Giving Tree by Shel Silverstein is a must. Some might disagree since it is rather poignant, but it's lessons are worth learning.
If you've never 'read' it (especially to a child) it starts out with, "Once there was a tree...and she loved a little boy." Shel Silverstein children's picture book tells the story of a loving tree who gave and gave and gave, and a boy who grew to want more and more and more.
It's a book worth adding to your Lemonade Shelf bookcase.