Do you have a 2 by 16 or similar LCD and you want to know hot you can display simple drawings and smileys? The HD44780 is a very common character LCD display controller. If you have such an LCD in hands, most likely it is controlled by such a controller. Chris from pyroelectro wrote a very nice and detailed tutorial in which he explains how can someone make his own custom digits. He used the PIC 18F452, but the the theory applies to all.