Birthday is usually celebrated by having a party by is thrown by the one who is having the birthday, or by people who care for someone and want to make them happy by throwing a surprise birthday party. Some of the people considered surprise party is more memorable compared to birthday party that they set by themselves. Birthday is one of the most celebrated day that most people have in their lives. They celebrate birthday to appreciate their lives and one of the way to express their gratitude that they are born and for all the blessings in their lives. Interior Design.