Give me an idea for repurposing my empty egg carton and instructions on how to do it.

You can repurpose your empty egg carton to grow seeds into small sprouted seedlings. First, fill each egg cup with a small amount of soil. Second, poke a little hole into the center of each soil mound. Third,  put 2-3 seeds into the center of each soil mound and cover with a small amount of soil. Finally, place in front of a bright window and water regularly to encourage growth. When the seeds sprout, you can plant them!