eh, I made ones like,
RAPTURE IS GREAT PLACE
TO RAISE CHILDREN
WOAH BACK OFF THERE BUDDY
THAT'S MY LITTLE GIRL THERE
FIND AN ANGEL
STICK A NEEDLE IN ITS NECK
ANOTHER BEAUTIFUL DAY
IN RAPTURE ISN'T IT?
Really I'd say it's best to base it in Rapture. It's easier if you've played the Bioshock games.