Here are a few examples of what you might emulate for your project.

Guerrilla Girls (critical billb0ard activism/art)

Barbara Kruger (photography/graphic design critical of modern society)

Cindy Sherman (photography critical of stereotypes and cultural expectations of females)

You can also use videos to create a commentary that is critical of a public issue:

You might also consider doing an image search for “street art” & “street stickers.”