I don't know what the deal is with the flowery wallpapers, but fortunately it can be changed. MS must has some little girly girl guy doing this.
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With Windows 8 RTM right around the corner, true candidate builds are already in the hands of many for voting and scrutinizing. If you have been salivating about getting your hands on, what is believed to be the default Windows 8 wallpaper, we have the image posted below for your right-mouse clicking pleasures.
While we can't personally confirm that this is the default screen, the evidence is supported by several posts over at techit.co.il and do align with previous images that have surfaced around the web. Enjoy
(http://i49.tinypic.com/2ilkh3k.jpg) (http://img201.imageshack.us/img201/6074/10636641.jpg)
click to enlarge 1920x1200