Probably the most functional of motivational posters come from the words of Kurt Vonnegut:

AAAH! Snow zombies are attacking! This picture, sent into The Star, isn’t as terrifying as it actually is…

These faces were made by pressing into the snow, and the shadows are such that it makes them look inverted, like this optical illusion.

I forsee a Worth1000 or Flickr group doing this soon – split-screen of your school photo and one from today, called an “AgeMap” by artist Booby Neel Adams:

Adams’ website expands this to parent/child and (nsfw) married-couple pairings as well — the lining up of bodies is the most excellent feature of any of them. Found via TheChive, who always does a horrible job of crediting their sources.