What pictures should i put on my poster?

well, in history we're doing this project and i'm in charge of the poster and im just going blank right now since school's almost out, im check out lol. but our poster is about the 2000's. i know i'm gunna print a picture about 9/11, obama, lady gaga and britney spears. please help me think of more things! (inventions.. games.. tv.. political.. sports.. clothes.. ANYTHINGGGG)