I used a charm pack of Disney and cartoon characters that I purchased on e-bay (sorry, no longer sure of the seller, but if you did a search I'm sure you could find something!)It was kind of a neat package of materials, as it contained everything from Mickey Mouse and Strawberry Shortcake to the Grinch and Buzz Lightyear. The main attraction for me was that it had a little bit of Batman and Robin in the charm pack. My son is going through a superhero phase (don't all little boys??) and was so excited that he got a blanket with them on it.
I had a hard time figuring out the layout, so I chose to go from lightest to darkest. The Transformers material for the center and the outside corners I purchased at the local fabric store, as well as the blue toned borders.
I think the original pattern is more symmetrical in the fabric colors, but what the heck. It's an original. The pattern was super easy and quick, and I enjoyed making it. Voila!! A craft for you that didn't suck any of my creativeness, which is good, since right now I have none :)
Also wanted to share a fun site with you, http://www.befunky.com/. I uploaded a picture of myself and cartooned it (or one of the funky editing tools they have) and this was the result.

I think it looks kinda cool, but the resolution wasn't very good for saving it to my computer, I think for printing or enlarging it or anything the quality wouldn't be the greatest. It's a fun site anyways. Another site I love for playing with pictures is http://www.picnik.com/. They also have a great variety of one (or two) click features which enable you to do all kinds of things to your photos. Playing with the same photo, I came up with this on their site.

The nice thing with the picnik site is that when you re-save the picture after making changes the resolution and quality is still good enough that you could do something with your creation afterwards. So check them out, they are way fun!