Take to the sidewalks and chalk about Rush! I have plenty of chalk from the office that can be used or, if you prefer, you can make chalk paint by mixing 1 part cornstarch, 2 parts water, and food coloring of your choice. Chalk whenever you are free to do so, however, keep in mind that major class changes occur around 11am, 12:05pm, 1:10pm, and 2:15pm and the sidewalks will see heavy traffic.