I found this site on Pinterest earlier today and thought it had some interesting writing prompts. http://writingprompts.tumblr.com/post/17477297690/my-28-most-tried-and-true-writing-prompts
We have also been writing a daily journal entry by using the website www.wonderopolis.org which has an interesting wonder each day and video and information to explain the wonder. Both of the sites are free sites to access.