An Audio Tape Love Letter
Send your wife an audio cassette tape with a love letter written in gold pen on the magnetic tape.  Put a tab on the end of the tape that says “pull me” so that she knows to pull out the tape to start reading the letter. 

Message In A Bottle
Write your wife a love letter and put it in a bottle.  Mail the bottle to her. 

Secret Admirer
Pretend to be your wife’s secret admirer. Type a glorious infatuation letter to conceal your handwriting. Try to make sure there are no tips to give you away, but put hints in it that would make her think it might be somebody else she knows. Use things you might know about her job, or places she might go, but things other people can also know. Sign it Your Secret Admirer, and send it to her by mail. Send flowers, candy, poetry, and anything else you can think of anonymously. Do this for a week or even as long as a month before letting her know that you are her secret admirer.

A Treasure Hunt
Set up a treasure hunt to have your wife go around the house finding “clues” to the location of a love letter.  Hide clues in the cookie jar, ice cream container, under her pillow, in the bathroom, on the tv, in her dresser, in her shoes, and so on.  The last clue leads her to the location of the love letter.

A Single Rose Love Letter
Purchase a rose and pluck off some of the petals.  On each petal you pluck off, attach a 1 sentence note to your wife telling her how much she means to you.  Placed the rose and the petals with the notes face down in a box that you present to her.

Say it with their name
Send your wife as many roses as the number of letters in her name.  With each rose, write a message starting with the first letter of their name. Underline the first letter of every message.

Another Message in a Bottle
The next time you surprise your wife with a bubble bath, write a love letter, stick it in a bottle, cork it, and float it in the bath water.

Refrigerator Love Notes
Buy magnetic letters and use them to write your wife a love note on the refrigerator.

Love Note on the Mirror
Use a soap bar and write your romantic message on the bathroom mirror. It won’t do damage to mirror and is easy to get off with a little water.

Book of Love
Write a letter about each of the things that you love about your wife and how much she means to you.  Put all the letters together into a little book and give it to her on a special occasion.

A Note A Day
When your wife goes away for vacation or a short trip, write a love letter on a separate page of a pink colored notepad for each day that she’s gone.