Here are some ideas:
You are stranded on an Island for 3 days, your only resources are those found in the overwhelmingly beautiful landscape.
Your eyes are two different colours, one blue and one green, the green eye sees truth, but the brown eye sees much much more.
You are the most famous 3rd Grader in the world.
Also, the book Writing Magic is lovely for Imaginative or Fantasy essays, stories, and books!
This is from Romeo and Juliette, Act 1 Scene 1. In this part of the
scene, Romeo explains to his cousin Benvolio that he's in love with a
girl named Rosaline, that she is beautiful and smart. However, he tells
Benvolio that she doesn't have the same feelings for him and that she's
sworn to live a life of chastity, which causes Romeo to "despair".