Give me six story ideas for writing a children's book.

1. A dog gets lost and needs to find its owner.
2. A child is exploring a field and discovers lots of animals hiding in it.
3. A child and their doll go through a day, waking up, eating breakfast, going outside, taking a nap, reading a book, eating dinner, taking a bath, and going to sleep.
4. A giraffe astronaut flies to Mars and discovers friendly Martians who help the giraffe to fix his spaceship and return home to Earth.
5. Ten different animals must work together to pass a letter from a remote village to an apartment in a city.
6. The book can explain the concept of gravity in simple, funny ways which entertain both parents and children.