So I took the liberty and asked the people at Tempaper for a sample, and received a nice little packet within 10 days. I got a small rectangular sheet of each design. They are easy to peel off and very easy to apply. I just pasted them on the wall and peeled them off to reposition if I needed to. I left them on overnight to see how well they would peel off the next day. This morning, they came right off w/o taking any of the wall paint.
So, in conclusion, I'm willing to give it a shot for the real deal. This is much easier than all the prep I would need to do for real wallpaper.
Thanks Danielle! Anyone else have experience with temporary wallpaper or Tempaper?