Dom/Sub ideas

The hubby and I like to spice things up with me being submissive to him in bed. Right now it's just the basics really-him holding me down, tying me to the bed, smacking my ass. Man, I love it! But we've been doing it for a while and I'm trying to think of the next level we could go to. I would love to be submissive to him for a full day around the house, but we have a kid so that's kind of difficult lol. Any ideas??