Check out Laurie Hale Anderson's Blog Post and try her suggested writing prompt on her Goodreads' Blog!
Excerpt from Laurie's Prompt on Goodreads:
Today’s Prompt: Quickly write a paragraph about what your days were like in second grade (around age 7). Then choose a fairy tale from this list. Pull one of the elements from the fairy tale and write about who you would have reacted if it showed up in your life when you were in second grade. For example, what if your new babysitter had been Cinderella? Or the giant from Jack in the Beanstalk?
NOTE: You can only use the minutes you are actually writing towards your goal of fifteen minutes. Time spent reading or thinking doesn't count.
ANOTHER NOTE: Loosen up! Have fun! Start Scribbling!
Believe In Truth, Beauty, Freedom, Love, and the power of the Written Word!