This idea is very very veeery nice for valentines day. It´s not hard to make, and it´s a complete gift.
The idea is to make one present related to each of our five senses, of course you can innovate and make it personalized anyway you wish.
Make five boxes, write over it the sense that it represents and put something inside.
Sight: Photo, book, video, etc...
Smell: A small perfume, candle, lotion, etc...
Taste: Chocolate, wine, etc...
Hearing: A cd or an ipod, or anything with a music that both of you likes.
Touch (the last box):Put a coupon good for a massage. Or just don´t put anything inside the box, and when he/she wonders what that means, just give a big and nice kiss!
Well, as you can see, you can innovate anyway you want to. Just be creative!