any thing that will stick and then can be easily removed is ok too
http://2.bp.blogspot.com/-SApRma9hD7w/TiY-wqAZroI/AAAAAAAAAHM/KRM5but ...
http://3.bp.blogspot.com/_nQYLKf_XIm0/TL2ZpH2WhGI/AAAAAAAABkI ...
... /-zv3nXbKiCr4/UMIL_9LM0DI/AAAAAAAABOU/DkNdFieHBY0/s1600/wallpaper.jpg
