Not what you have been thinking ... but I like the fresh spring look of the white in those in-between blocks!
With the plain white, you could have fun with green thread for the quilting, which would tone down the stark white look. Or if you did not want a plain white, you might be able to find something that "reads" white but has some of the green in it.
To me, black blocks would give a very dark quilt. And depending on the gold colour, they may just jump out too much over and above the black and greens.
You're inspiring me, as I have had St. Paddy's fabrics bought for a few years now, and just have never got around to it!