MakeBeliefsComix (http://www.makebeliefscomix.com/) is a FREE website that has been around for some time now. I have recommended it before but now they added even more! There are new characters and clip art. In addition, they have added a new section on how to use MakeBeliefsComix with children who may have autism, learning disabilities, physical disabilities and more. You can check that out here http://www.makebeliefscomix.com/Special-Needs/. This website is a wonderful for the reluctant writer. Some teachers can offer the option of creating projects using a comic strip instead of a traditional written report. It is certainly worth your time to check it out if you are a school based occupational therapist.
While you are there don't forget to check out their section of free printables (http://www.makebeliefscomix.com/Printables/) - plenty of great drawing and writing prompts ALL FREE!