A friend tipped me off to despair.com which has a bunch of things for the pessimistic at heart. Mostly though, it’s just demotivational posters. These are a parody of the classic posters garnished with soaring eagles and words like “excellence” followed by a sentence or two explaining what excellence is in the work place. They also have a mug with a line to mark the “half empty” point. It’s worth a look for a cheap laugh (cheap unless you buy something anyway).
Another favorite of mine is “Get to Work. You aren’t being paid to believe in the power of your dreams”