This is perhaps the most personal lesson we have done so far. My school is in an urban environment and students see a lot of "graffiti" in their daily life. The students were really invested in this one and most spent nearly two weeks working on them. We began with a slide shop to look at different types of graffiti art. Of course, we talked about the difference between legal and illegal graffiti :-). Next, we watched a you tube video from DK drawing. Students were able to watch a "professional" graffiti artist complete a tag from start to finish.
There were not too many specific instructions for this one. I provided the student with a handout of different fonts and that was about it. They were also given the option of creating their own tag name. I am quite impressed with these works of art!