First of all, beautiful fabrics!! And I love how you put them together. :)
For the border, I'm with Ruth on this one. I'd add more than one border. Since the fabrics mostly read "garden" or "organic" to me, I'd use a darker green small inner border to stop all that color, and then bring the color back in, in a larger outer border. I like K9's idea to make strips, or you could make any kind of 10" block you wanted using the scrappy look (half square triangle always finish off a quilt nicely for instance). You could also keep it simple and just use a lovely garden(y) fabric for the outer border. If I did that, I think I'd use a flowery fabric that was a little less densely packed with flowers or leaves. More light spaces between the leaves/flowers in the fabric design.
No matter what you choose to do, it's going to be lovely Henry. :)