Ok let me first say I do not have De Menthe and I am only going off of what I seen for rec's given on other forums.
I have heard the steamy is very close on less deep green.
BE Mermaid, some have also said BE Socialite.
Benefit Mint Julep when used wet.
Now I was told that Cargo Costa Rica is super close and even a prettier color!
I plan on getting Costa Rica soon. I've tested it a few times at Sephora and I have to say it is a lovely color!