There are times when you're just overcome with an urge to thank the people in your life. It could be a significant other that cooked you a sumptuous meal — and washed up after you — or it could be a coworker that saved your ass in a meeting you weren't prepared for. When some genuine display of gratitude is in order, a verbal "thank you" just won't cut it: Real grown ups show their appreciation with thank you cards, or better yet: a thoughtful gift.