I noticed all these desktops and while the pictures are beautiful I'm curious aren't they distracting ?
And my second question, do you like skeuomorphic (textured) interfaces or modern flat ones ?
I mean people are talking nowadays about how distracting are textured interfaces (even if they have just a hint of subtle gray texture) and how only the content should be visible while maybe a colleague of mine works on something windowed, not full screen, and in the background a yellow bright sun on a blue sky stare at you, and of course parts of the clouds are visible through the transparent interface (which suddenly became textured with clouds).
So it seems me and my desktops are quite the opposite because I really find distracting, colored things while I work, that's why I use a gray flat (really flat) background, but I don't mind some subtle details in my interface if it allows better visibility and faster workflow.
1) Desktop pictures can be distracting but also inspiring - depending on the circomstances.
Sometimes when I just have some file managing to do, I find it pleasant to have an inspiring background behind my Finder windows. But, I'll admit, most of the time I have one or more apps open that fill the screen. Then, of course, I couldn't care less about my wallpaper since I don't get to see it anyway.
If I do set a wallpaper, I'll go for a relatively quiet one (not the bright sun on blue sky... you're describing). And if I can't make up my mind, it'll be a simple solid color like gray or graphite.
2) I'm a big fan of a minimal GUI, but only if it is 100% consistent. Apple's MacOS is slowly getting better, I'd say Mavericks is quite OK with room left for improvement. I don't like skeuomorphics at all, with or without iOS7.