I think you will like this writing prompt offered by a friend and author, Esther Cohen, to students in her workshops. It is based on the theme: What I Want to Tell You.
There is so much to write about when you think about this theme. Perhaps you want to tell someone about your beloved pet.
Perhaps you want to write about your hopes or dreams or deepest wishes.
Perhaps you want to express some pain or worry in your heart.
Perhaps there is a funny story you want to tell.
It’s all up to you as you write about something you want to tell others, or perhaps just tell yourself.