Just totally random and useless projects which will continuously work unless you stop them yourself. First: A program that calculates the total number of students in a class by adding the number of boys and girls. Second: A program that will magically tell you the current year if you tell the correct year which was 2 years ago. Third: A kinda useful program that can convert Fahrenheit to Celsius. Just tell the Fahrenheit value.
Totally original and creative idea! ;)