Write a song that prominently features a plant. It can be any kind of plant—a vegetable, a flower, a tree, a weed, etc.

Write a song with a time change. It can be a change of tempo, time signature, a time shift in the lyrics, or any other time-changey thing you can dream up.

Write a song where the narrator is addressing a child.

Write a song about someone who has a different job than you do. The job can be an incidental detail or the whole point of the song—your choice.