to spice it up (and we had to...been ttcing for 8 months now), i just do some things out of character. one thing i'm going to do tonight is cut his hair (which is normal), but in some lingerie or maybe nothing at all...of course, this happens when the kiddo is asleep. i also wrote him a love note with lipstick on the bathroom mirror...the occassional sexy text message, that sort of thing.
i was in quite the dump not too long ago and realized that part of the fun is being intimate, so i also had to change my own thinking.
good luck!