Well, I used to buy her books (remember those?) about subjects she was really into. She preferred that to jewelry. I'd sometimes tease her about how she liked Bartok, but she knew that was in good fun. I complimented her on her talent for music.
I -tell him so -call him an idiot (playfully) -call him a meanie (playfully) -poke his belly button -hug him a lot -tell him he's mine -so ridiculous things around him (like mess with his hair or grab his arm and tell him it's mine now so he can't have it).