The Onaman Collective is offering free banner images for land and water protectors here: http://onamancollective.com/murdoch-belcourt-banner-downloads/
Three indigenous artists compose the collective – Christi Belcourt, Isaac Murdoch, and Erin Konsmo – and they even offer a how-to video:
To learn more about the Onaman Collective, please visit: http://onamancollective.com/