ENTRY #2 gets my vote. It looks like it would look terrific as the background to signatures and avatars (example above me lol, not same but similar). Entry #1 just doesn't look like it would fit well together with any images :\
I hope nobody ever uses the first entry as a background to any signature picture. NatsuDragneel, you have to remember that : the theme is background, so these are not stand-alone works, they are images that would have to work well as the background (not foreground) of a signature picture.