For the love of all that's holy, people, show some appreciation! Even the civil engineers are getting depressed (xkcd.com by Randall Munroe)
I tell ya', if we put more than five minutes into that data model or that architecture description in Visio®, you should be darn grateful!! It's not like the customer is always right, or you're paying the bills, or anything... Or, wait, what was that you said? Ah, sorry. Forgot myself for a minute there. Of course, you're right, I should add color to my logical data model diagram. Pastels you say? Right away! And I'll be sure to remove any ugly, offensive crossing lines, too.
Heh. It'd be funnier if I made up that little vignette, wouldn't it?