The results were very mixed, as you would expect. It was a fun thing to try though. I keep meaning to take more double exposures. Some of my Lomography cameras make it very easy to do them (such as the Fisheye 2, which has a special button for it), but I often forget to use the feature.
Here are my favourites from our experiment. I live in Birmingham, UK, and Asja lives in Zagreb, Croatia, so it's interesting to see our different locations blended together.
The school appears to be in the sky ;)