So this idea is to create simply and fast a practical, design option for your wall. Some different designers give great opportunities to create an interesting wall with a wallpaper or paint. The left one is from 0900-design. By matching the blue colors of the sky and the sparkling trees the wall is like a festival. The second picture is from Sabine de Wit. You can paint the tree easily on the wall with some black paint. Put some hooks in the wall and you can change the design every day!
And the right picture is from the collection on Eijffinger. This brand has got really fantastic designs for your wall!