Here's a slideshow of the large new mural on the Green Hammer building on SE 6th, just north of Madison. It was painted in October 2014 by Stefan Ways, who posted a short "making of" video about it to YouTube. The video caption describes the design:
A hand holds a wood scribe, carving a half circle - contained within it in grayscale are city landmarks including the abandon factory at Fields Park, Hawthorne Bridge, and Union station.Outside the circle are images I referenced while hiking "The Gorge" east of the city. Swallows fly about transforming from the wood chips pulling the viewer toward "OR7", the lone wolf, introduced into western Oregon for the first time since the 1940s, and now has a mate and offspring - showing the importance of how vast, preserved wilderness allows for even the most endangered of species to thrive once again. All in all, this mural depicts a city, Portland, surrounded by natural beauty and wonders.