I'm getting a bit big and ungainly at 31 weeks but have discovered there is fun to be had with my sizeable belly.
Last night when the baby was active I put a tall plastic cup on my belly and lay down. The cup started moving - jerking up and down with every kick, and rolling about and tilting as the baby shifted in the womb. DP was fascinated and ended up addressing the cup like it was his progeny.
Mariah Carey drew artwork on hers.
Any other suggestions?