Traditional endearments became classics because they follow the K.I.S.S. principle: "keep it short and simple." Thrill your girlfriend with a handful of messages such as, “I love you,” “I miss you” and “You are my sunshine” on a number of small, heart-shaped notes. Add a personal touch to this gesture by tucking them on top of her car visor so that the notes will shower down on her when she uses it for a sweet surprise. Consider other unexpected places too, such as a footprint love note in freshly fallen snow, or traced on a bathroom mirror to appear the next time she showers.

Write love notes describing qualities you like in your girlfriend, using the letters in her name. As an example, for Sharon, write something like “Sexy” for S, “Honest” for H, “Artistic” for A, “Optimistic” for O, and so on. Put each love note in a place where she is most likely to find it after returning home. For example, you could place the starting note on the bathroom mirror, then one on the refrigerator, one on dinner table and end with one under her pillow.

Write a series of tiny love notes with humorous, erotic and emotional messages, such as, “I love you so much, I'd carry your little pink purse for you in front of my buddies,” “You can make me want you with just one look” or “I see our future in your smile.” Write as many love notes as possible. Put the notes in an empty bottle, such as an aspirin bottle. Stick a label on the bottle that says something like, “My Love Medicine for You.” Place it on your girlfriend’s dressing table or in her medicine cabinet.

Arrange photographs and other small mementos that your girlfriend has given you over the years in a scrapbook. Now, stick love notes on each page and describe how you felt when that particular photo was taken or when your received that particular memento. For example, on a page with a photo taken during your vacation, you could say something like, “One of the best times in my life. I remember you having such a wonderful time, which made me feel so happy and wonderful.”