SAHMs, what do you do all day?

I've been a stay at home mom to my 16 month old since he was born but lately I can't seem to find anything to do with him! anytime I get down on the floor to play with him he doesn't really want to play. and then he just ends up attacking me and biting me lol. it's been too cold where I'm from to take him outside. please help! I need some activities to do with him!