Shirley Temple lost the part in The Wizard of Oz to Judy Garland. So then she was offered the role Mytyl in this fairy tale movie instead.
Mytyl and her brother Tyltyl are the mean and selfish children of woodchopper's that one day captures a rare and unique blue bird in a cage, and refuses to let her sick friend to see it, and takes it home. When they wake up the next day (and suddenly the movie went from black and white to colored!) they find themselves in different world, and meets the fairy Berylune who sends them to search for the blue bird to earn happiness.
And many odd people, creatures and situations they meet on their search.
My favorite scene is when they visit heaven and meet all the children that are soon to be born, and they meet the girl who tell them that she will be their sister in a few years. And God would choose a few of the children every time and take them to a seperate room in the heavenly kingdom that he would send to earth. Every time he was about the choose, some kid always tried to sneak in, even though it wasn't yet their time.
And another nice scene was when they met Mr. & Mrs. Luxury, who was played by Nigel Bruce and Laura Hope Crews (you know, she who plays Aunt Pittypat in Gone with the Wind).
Though it was a huge box office flop, I think it's a pretty good children's movie. I am a little bit older then the main audience this is intended to and I know I would have appreciate it even more if I would have seen this as a kid, but it's still worth 70% which is pretty good.