I use the following ppt to generate the task my students will do in order to show their learning. i.e. if we were doing a lesson on percentages I would run the random learning generator, if 'do the task as a facebook page' came up the class would create a facebook page around percentages. There are 50 different tasks the students could do. Adds a bit of spontenaity to lessons and the kids love the randomness of the activities!