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Toko, check out successories.com for examples of the kind of images you are looking for. (This is the site that despair.com is mocking with their products.) Unfortunately, these motivational images are sold as prints, and I don't know if there is a way to license their use for web pages. Might give you some ideas, though.
despair.com is definitely the place to go if you're looking to decorate the office though! ;)