Are your students All about the Benjamins?
This is a great interdisciplinary lesson for all grade levels. Last year I did this lesson with my level one high school art students, but it could easily be modified for grades 4+. It's got built in motivation, what student doesn't love money?
There are so many ways to go with this. You could start off with a timeline of how the US dollar bill has changed over time. I chose to start by having the students create an inventory of the symbols and to guess the possible meanings. Variations could be do to have students compare/contrast to foreign currencies.
I'm revisiting this to see if I want to bring it down to my fourth grade classes who will soon be working on the travelling iPad cart. I think the lesson could easily be done entirely on the computer.
Five lesson plans, student samples, rubrics now posted on my TpT.
Teacher examples (ink)
Teacher example (with watercolor "watermark")