I liked the Blue Vinyl Bag bit! As the author points out, the main thing is that everyone who sees your CoA must understand what the name refers to. I remember those blue bags from the bank - it is actually a thing, and pretty easy to remember. Provided that all the folks who are privy to your books understand the name of the account I see no harm in it. Probably not a good idea to come up with crazy names for all your accounts...but just one? Have a little fun, I say! Just be super-clear about it with those who need to know.