It's lovely.
ITA with the PP who said the white would wash it.
My first thought would be a nice strong frame on it ... the darkest of your turquoise. Width about 1-1/2 of the size of your blocks.
That is unless you are wanting the size increased. Then maybe work with the other colours, but keep it simple, so as not to draw from your nicely done pattern in the centre.
Second thought, would be to bind it the way it is. Again, the darkest turquoise.