I came across www.stripgenerator.com recently. It's very intuitive and easy to use (I made this first cartoon in 10 minutes or so). Seems to be lots of potential for creating Concept Cartoons to start (philosophical) dialogue with. I will create a few more this week based around popular P4C concepts. Please let me know if you try them with children and whether they work or not … ;-)

Update: I've created 3 more cartoons. One more about identity, another about Reality, and the last one about Fairness. Check them out at: http://jabulani4.stripgenerator.com/gallery