A colleague of mine bought a magnetic word kit this past weekend. The play area of their website would be great for group work and would be a cool tool to use with the Promethean boards. You could have the students work together to make poems, write sentences etc.
The online sets have words separated by categories: Artist, Genius, Poet, Office and Romance.
Visit the site an make an original poem. http://play.magpogames.com/
They even have word kits in other languages which would be great for second language learners.