Oregon Expat this week, I was reminded about Raven maps. I shouldn't have needed the reminder, since the MN one is on the wall of my office. This company creates gorgeous, large, shaded relief maps which are laminated and ready to hang. Mine measures about 4' high by 3' wide.
The company's website is here, but unfortunately it appears they only offer small thumbnails for viewing. You can see much better images at Geology.com.