Write a story about an old pair of shoes who are separated when they are thrown away. Write about their loneliness without each other, and their journey to be reunited.
Give the shoes personalities that are complimentary or conflicting. Think about what it might be like to be part of a matching pair, and then to have all that suddenly taken away from you.
Find more writing prompts like this at Creative Writing Prompts To Get Your Ink Flowing.