Yes, the focus colour is green and the other colours show how you can balance the green against pale pastels and an off-white neutral. In no way do you need to think GREEN ONLY. Sometimes the best way you can showcase a particular colour is for it to be the contrasting pop of colour against other things. So if you think of say a Christmas tree against other colours, the green of a leafy wreath, that sort of thing - you don't have to go monochromatic and green only unless you want to. :)
If I find the right shade in my cardstock pile or my ink drawer I'm thinking of using it for a festive bit of foliage. :)
Well done to those of you who have already got something made - way ahead of the game! ;)