In the dorms our walls are push-pin friendly. I wanted a way to hang some posters of my drawings but did not want to use push-pins because they create holes. Luckily I love magnets. This solution should allow you to easily take down your poster and post it up some time else without creating and widening holes in your poster.
And just to advertise myself, if you wanted to see the Ringo Starr drawing, here's a link to my drawings on flickr