About twice a year I swap out the stickers on the rear window of the pickup truck. I keep it low key, no more than two or three at a time. Skulls, Jolly Rogers, and skeletal fish are favorites, but the current crop is a little different.
Image #1: the overview featuring the current new set of three.
Image #2: Ahhh, Queen. They were good boyz. The word "queen" being on my truck could be a slight double entendre. :p 
Image #3: Area 51 and Soma FM.
Image #4: closeup of the Area 51 sticker for all you fans of extraterrestrial life.
Fuenteovejuna did it 
Love it!!
A51 stickers FTW