I would also have some questions that students could use that would be appropriate for students to ponder in relationship to the image/words that were chosen. This will help those who say they don't know what to write. I would try to have at least 5-10 questions. This way no one can say they don't know what to write.
After you have given them enough time please have a few share their writing. Make sure they are reading what they wrote...not just talking extemporaneously off the top of their heads.
Links: All Words:
Please preview some quotes maybe more appropriate than others to use...
http://www.goodreads.com/quotes/list/3717966
Picture Links:
Please preview some pictures maybe more appropriate than others to use...
http://pinterest.com/ameliem/beautiful-things/
http://pinterest.com/ameliem/inspirational-words/
http://pinterest.com/ameliem/weird/
http://pinterest.com/ameliem/vintage/
http://pinterest.com/ameliem/paris/
http://pinterest.com/ameliem/dance/
Mix of Pictures and Words:
http://pinterest.com/ameliem/books-in-pictures-and-words/
http://pinterest.com/ameliem/words-of-wisdom-for-everyone/
http://pinterest.com/ameliem/oz/
Remember...Please preview some words/pictures maybe more appropriate than others...