My students LOVE these color sheets of real World War I posters. There is an analysis sheet also in this zip file that I copy on the back of the posters. The students are to research their poster on the Internet to color it accurately. (I made a simple Power Point presentation of the original posters, that continuously looped as they worked.)
The analysis uses high order thinking skills, and also includes three extra activities that could be used for gifted and talented students.