Shepard Fairey is known for creating the Andre the giant has a posse sticker. At first it was for his peers and friends, but then the public got curious and it turned into a popular thing. He created a series of posters supporting Barrack Obama. One of them includes the iconic hope poster. It helped Obama win the campaign, and Fairey had sold around 300,000 stickers and 500,000 posters during the campaign. He did not keep any of the money for himself, instead he used it to make more art work.
I choose to work with the jobless people issue. Most of these poster will have a homeless person on the poster and the words will probably say hire me. People might also put their own twists to it. I would put the words help at the bottom of the poster. I will also use 3 to 4 pantone spot colors. Most people who make posters like this use the ideas of Shepard Fairey.