Here is another idea that will broaden the thought process, yet be based on the students' real experiences.
Have the students think about something of interest that happened on any of their holiday days. They then have to write three essays giving three perspectives of that same event. For example, through the eyes of their mother, the baby and the dog; through the eyes of grandfather, the neighbor, the maid; from the perspective of the goldfish, a man, a woman.
This will give them a focus in which they can take a real experience and make themselves look at a situation in a variety of ways. Creative writers will enjoy embellishing, while other writers will be encouraged to find some interesting perspectives based on the same event.