Become a MacRumors Supporter for $50/year with no ads, ability to filter front page stories, and private forums.
The wallpaper I cannot answer, but if I were to venture a guess I believe the person simply added a picture of a triangle with drop shadow on top of the bow tie app with geek tool/nerd tool.
 
Register on MacRumors! This sidebar will go away, and you'll see fewer ads.