Pcgamer.com recently had a cool article showing real-life spacecraft creations in Kerbal Space Program. http://www.pcgamer.com/kerbal-space-program-2/
It's cool that somebody took the time to think about how to recreate these models of famous spacecraft. I found it amusing that he says the smaller spacecraft - particularly Pioneer 4 - were so small (only 6.1 kg!) that the thrust simulation in the game would make it go extra long distances with ease.
As several of us in APC already know, after the AP exam we will get to play around with Kerbal Space Program in class. I personally think it's a fantastic game and is as close as you can get to simulating real life space travel for only $20.