I like this exercise, because it takes you away from the keyboard and allows you to handle letters and words in a way that's unique to those beginning to write, learn words and apply landguage. Do you remember how you would mouth each letter and dig your pencil into the page when you first learned how to write? It was more a physical activity than an intellectual one...and it made the results that much more real.
Gather together several old newspapers and magazines that you don't mind cutting up. Cut out different headlines and sentences as they catch your attention. You can also cut apart the letters of words, so you have individual letters as well. Then take your clippings and use them to create a short story, about one paragraph should do to get you warmed up for the rest of your work.