Thanks for the third one (planet in space). I've always kept my icons on the left side of the screen, and yet every wallpaper I''ve seen puts interesting stuff on the left edge -- stuff which gets obscured by my icons.
Finally someone made a wallpaper which puts the coolest bits to the right, where I have the empty space to fill.
PS: Something with actual Starfleet characters in it would be welcome too. I'm just sayin' ...