One good topic could be a day in the life of a pet. You can show all the funny things they do, like chasing their own tail or begging for treats in a really cute way. Another topic is a misadventure at school. For example, a student accidentally glues their hand to the desk. Or you could do a story about a magical forest where all the animals can talk and they have to solve a problem together, like finding a missing key to unlock the magic gate.
You could consider writing about a character's journey of self-discovery. Maybe they go on a solo trip and learn a lot about themselves and the world around them.