One of my favorite writing activities is to have the children complete an add-a-sentence story. You can do this in a variety of ways: One way would be to have all the students write the same sentence on the top of a sheet of paper. Another way would be for you to write a different sentence on the top of each sheet of paper and hand them out to the students. A third way would be to have the students write their own starting sentence. All you need to do is have the students write one sentence and pass their paper to the next person. Then, when a student gets a paper, he or she reads the story and adds a sentence. Once everyone has their own paper back they can read the stories aloud to the class. This is a great activity because it involves reading, writing, speaking.
There really are a lot of games that give students meaningful writing experience. Just check out the website
www.teachingenglishgames.com for some great free ones.