I am in charge of organizing my team's walk for breast cancer awareness. We wanted to make some shirts for the walk. I had originally thought about tie-dye, but am concerned about the amount of time and headache that may cause. (We have to have the shirts done this week). If I just do fabric paint, what are some ways I can snazz it up a bit? Also, does fabric paint work on polyester shirts, or is cotton better? Thanks!

P.S. I am trying to make the shirts as economically as possible.