My (then) boyfriend did something like this for me when we lived together ... wrote I love you or I "heart" you or smiley heart faces, etc on an entire stack of mini Post-its and left them on the inside of the front door before he left for work. I found them when I got up later to go to school. Ten years later, it is still one of the most romantic things any man has ever done for me. Thanks for the memory :)