Just came across this fun site called Despair.com that provides "Motivational products and posters for pessimists, underachievers, and the chronically unsuccessful." --
http://www.despair.com/
They have a "Do It Yourself" center where you can make your own motivational posters, or about any other kind of poster you can think of. Here are a couple of examples:
poster9390980.jpg
Diplomacy Poster.jpg
Just thought some one might have some fun with it.