I have:
-Alpha Phi long decal across back window
-Florida Institute of Technology long decal across back window that will probably get replaced with a smaller "Florida Tech Alumni" sticker so I can park at the school for free. I pay your salary campus security!
-Alpha Phi license plate cover (might replace this with a "Space Shuttle Team Doing What Others Dream" cover)
Then from my rearview mirror I have a soccer ball and the coolest air freshener EVER: