What are acceptable colors for a man's umbrella if you go by stereotypes?

This was the topic of discussion in the car on the way home. I’ll tell you what my kids said later. I’m interested in the six primary and secondary colors, black and white and then any further combinations that might appear in an umbrella, including multi-colored umbrellas. So off-the-wall is fine, too.

Of course pictures would help illustrate your point.