Number Three: Halloween jack-o-lantern

For Halloween, you can carve a pumpkin with some sort of message ("I love you" or "no trick, you're a treat" or something equally sappy or goofy) and put it on the bed to surprise your significant other when they get home/go to sleep/whatever. Fill it with some sort of treat they like - favorite candy, CD of favorite artist... for an erotic twist, fill it with edible body paint or stuff like chocolate syrup, whipped cream, etc. (I don't mean fill it with LOOSE chocolate syrup, I mean a bottle, okay? Otherwise this gets way too messy.)