I love the look of reimagined World War II propoganda art. Unsure of what they look like? ThinkGeek has an awesome selection of them, with artwork depicting the fictional worlds of Star Trek, Battlestar Galactica, and video games.
Kate Moore, a favorite printmaker of mine known as Blimpcat on Etsy, has created a number of WWII propoganga posters inspired by the universe of Harry Potter. "I like to imagine what it would look like if both sides had their say (rather than just He-Who-Must-Not-Be-Named's people)," says Kate on the Etsy pages for the prints.
The prints are 11x17" and "digitally printed on heavy, high-quality glossy cardstock." She stamps and numbers all of her prints individually, so you know you're getting something special.