Can you think of some little things to surprise or spoil someone with?

My housemates and I have all gotten another housemate randomly assigned, with the idea that, until Christmas, you spoil or surprise that person with little attentives, without that person knowing it’s you, as if little gnome’s having been doing that for you. Think doing someone’s dishes, or sneaking a chocolate bar into his or her pocket, those kind of things.

Now, with Fluther being the nice attentive community that it is, I’m sure it can come up with some creative nice things I could do for the housemate assigned to me. So, any ideas?