My first thought was both .... green, then the darker border.
Then I saw you were considering more of the grey. Keep what you have add what I call a "racing stripe" of colour. Not too wide, maybe only 1/2" or 3/4" finished? Then your extra grey.
But seriously, anyway you go, it's going to be great. The look changes according to the colour chosen for the border, as in this case they can all work!