Once we had junior high school students in Japan take pictures of all the English words they saw over a weekend. There were about 20 students in my half of the class and we amassed over 500 pics. This was a very simple activity, but it certainly made clear how much English was all around them. We compared our words with my pair teacher who had the other half of the class. This activity was a success because it happened outside of class, it demanded cooperation to eliminate duplicate pics, and encourage a fun level of competition between the two classes.