Ever thought about a friend who has a big interview coming up or a "big deal" exam that they have to pass? Wouldn't it be nice to let them know that you're thinking about them by sending them a "Good Luck" card? I know that if I got a "Good Luck" card when I really needed it, it would really make my day.
Sometimes it's nice to let people know that you're thinking about them and the things they're facing. A little card with a positive note inside can go a long way.