Okay, you're done. How did it work out? It's hard, isn't it? But, admit it, you felt good keeping your complaints to yourself. (Okay, maybe you even felt a little virtuous and smug, but that's okay.) Did this exercise make you think it might be a worthwhile challenge to offer the teachers/administrators/staff at your school? Maybe set up a collection jar where someone who does complains has to donate “x” amount? At the end of the challenge you can use that money for something fun for the whole group to share. (Be sure to set up a new collections jar because someone is bound to complain about the reward at the end of the challenge!)
Once you start tracking your own complaints, you'll notice how complaining affects your life. If you are a teacher or school employee, imagine how basing most of your conversations on what's wrong might affect your attitude in the classroom and how that might rub off on your students. If you're approaching things looking for what's wrong, others around you will follow suit. Negativity is contagious.
Give yourself another challenge. Try not only to NOT complain each day, try to spin what you want to complain about into something positive. It takes some practice and creativity but, you will notice the change in your mindset and you will also see a change in your colleagues. As you change, they will more and more try to match your positive approach. It might not be conscious on their part but it will happen. It's hard to push your complaints when you're talking to someone who is taking an opposite approach.
Start with the challenge and work from there. Often just being aware of how frequently complaining is the basis of so many discussions is enough of a push to get you started on a more positive path. Seek out others with the same positive outlook and avoid those who see nothing but problems. After a month, reflect on the changes for the better that you're seeing in your life – personal and professional. You'll be amazed.