Football Foil Balloons
I'm not a huge fan of balloons inside a house as decoration (might be because there are always little kids around and balloons are bad for them), but football shaped balloons tied to your mailbox or your street sign will help your guests find your house.
Well obviously you're going to have at least one plate of cookies at your Super Bowl Party. Roll out sugar cookie dough with cocoa, cut out the football shapes, and decorate with white Royal icing to make the laces.
Normally, I don't like "seasonal" dishware that gets used once or twice a year then collects dust for the other 360 or so days, but a football-shaped serving platter would last from September through February.