Buddha at Bedtime is pretty good, I think it's put out by the FWBO, or someone involved with them.http://www.amazon.com/Buddha-Bedtime-En ... 1844836231
Probably best for something like ages 8 or older..the art is really nice though, and even my 4 year old could enjoy it, and do some of the simplified meditations.
You could nitpick a bunch about the book as an adult and practitioner, but seriously, I thought it was decent. To be fair, it is mostly folk tales and some stuff (iirc) from the Jatakas...as you can see from the amazon reviews, that irked a few of people. So yeah you won't be able to teach your kid the twelve links of dependent origination from the book (lol), personally I would never expect such a thing, so I thought it was pretty good for what it was.