Green. What kinds of things do you think about when you see the color green? Is it life-filled forest, trees, flowers? It is the color of your car? The color of recycling, of planet healing? The color of gemstones, or toxic biohazard signs?
Whatever it is, write a story that centers around the color green. I can be a description of a green places, people, things, or a story about a feeling inspired by green. Go all out. The only limit is your green imagination.