Sounds like a good idea - I have noticed that children's books in the US are often a bit too keen to include a very worthy moral theme. Although this is no bad thing in itself, I just find that American books are less than subtle about such things as making friends, bullying and having good manners.
I'm an ex Preschool leader and we had much more success with getting children interested in books and stories if the themes were humorous, anarchic, even just a bit 'naughty'.
Back in those days we always found 'Red House' books had the right choices, not sure whether they are still in business.