My very the favourite things I've ever knit was a glow-in-the-dark pink uterus with pose-able fallopian tubes. Small beads for the eggs...
I made it for my doctor, and he cradled it in his hands and exclaimed with total glee - "It has a cervix!" He put it on his desk. I'm not sure if he caught the fact that it was glow-in-the-dark... But one night, when the lights were out, he'd notice ..