In reply to bpmclimb:
I used to climb with a friend who had ropes that were called "death" and "cat sick", which at least meant you didn't get confused by any other pairs calls.
I like Mammuts colours although I seem to remember the names are a bit odd, isn't the blue one "sand"? Another friend has a bright pink joker that he insists is red so calls at the crag tend to sound like "Slack on red", "Sorry do you mean pink?"...