Books are another excellent idea to make your boss smile. Traditionally the boss gift days consisted of lunch with the employees and with flowers and balloons.
If your boss is very fond of coffees then try to gift him/her a basket of muffins, gourmet coffees or a mug. You can arrange a dinner or lunch to their favorite restaurant with their spouse. You can write a best anecdote about your boss to make him/her glad. If time allows then gift a nice pen to your boss. You can buy a magazine subscription for your boss if they love crafts and arts. Figure out the hobbies and interests if your boss and present them the related gifts. Few gifts are like chocolate boxes, a bunch o0f roses, a fragrance etc, are also the excellent idea. Take an audio cassette or CD with his/her voice recorded in that remains fresh always. You can present a gift that make your boss feels special. You can opt for e-greetings for that day. These cards convey some wishes to your boss without any hassle.
Gifts are the ultimate idea to show or convey the message to your boss and make him/her feel happy.