Here's a small mural of a tree, located on N. Failing St. at the little alley between Mississippi Ave. & Michigan Ave. (Aside: North Portland's "States That Begin With 'M'" thing is possibly the dumbest street naming scheme ever invented.) A photo by wiredforsound23 says this was painted by someone who goes by "Yourself". Who, as you might imagine, has proven to be quite impossible to google. Or bing, for that matter, and yes, I tried that too. So the pseudonym is not what I would call a successful personal branding effort. Maybe that's the entire point of the name, I dunno. At any rate, it's a cool tree.