I love Stampin' Up!'s Décor Elements, I have them on my own wall, along with other places. If you haven't seen how easy they are to apply check out this video.
I had bought a similar product (before we offered these) at a local craft store for my daughters room. The thing I didn't like about those is that there was an outline around the image from the clear part, plus after a while they started to peel off the wall. I have the Manhattan Flowers in my own bedroom, these look like they are painted on the wall, and they stay perfectly flat. I love that we offer these now.