Green Cards Once Again Green

Here’s a post from The Corner’s resident immigration guy:

It’s Finally Green Again! [Mark Krikorian]
Here’s the redesigned look of the green card:

It hasn’t actually been green for decades, in part, I think, because of bureaucratic stubbornness — they weren’t going to give in to some silly nickname. They seem to have thought better of that, which is good.

I’m genuinely curious: why is this good? In fact, why does anyone care one way or the other if a green card is actually green? Has this been some pet peeve of the anti-immigration community for years? Inquiring minds want to know.