Wall Pops.
If I understand it correctly, you get 5 13"x13" squares per pack and the stick onto walls, but easily peal off when you move. At $13-$16 for a 5 pack it's not cheap, though.
What's up LJ, what have I missed? :-)
Lake Washington 2013-10-23, a set on Flickr. Taken this morning on my way in to work.
IMG_5383, originally uploaded by adameros. Tonight's atomic sunset.