THE LOST KISS
Look around your boyfriends/girlfriend's room or house looking under things and appearing like you're searching for something. When asked what you're looking for, say "Well, I've been looking all day for a kiss but I can't find it anywhere. Oh wait, I found it." Then give your partner a kiss. Then, if you want to make it more interesting, say "No, that wasn't it. It was bigger and a little more tilted." Then give your partner a bigger, longer kiss.
HOSTAGE KISS
Cover your lips with tape and get your love's attention. When they come near, make noises like you're trying to tell them something and motion as if you can't get the tape off. Once they remove the tape from you to hear what you're trying to say tell them, "You've been saving your lips all day just for them!" Then kiss your love passionately!
POST-IT KISS
Make a post-it note trail that leads to your lips. On each note leave a lipstick kiss and an arrow or clue to find the next note. Place the last note over your lips with the words, "Lift for a kiss." on it
GIVE KISS COUPONS
This is funny, unique and original. I gave one before with a very cute and funny note attached to it (Sorry Marlon for telling *grin*). It works wonders though.