Lovely quilt as is, but I'd think that it would depend on how big you wanted it to be. If you're happy with the size you could consider it done and use the green for the binding.

I really like it the way it is, but If you really want to add a border, why not add a darker border, maybe a solid, dark purple? By the way, I love the colors in your quilt. They go well together.

I really like wonky and asymmetrical. And I so like the way your quilt skews what I think is the D9P block! Have you a pattern or source that you could share? And what is TD9 please?

Your quilt looks finished as it is. If you insist on using green make a narrow binding with it.

I like it the way it is, if you add another border I would go darker not lighter.

Your TD9 is beautiful, but what does TD9 mean?

What about picking another coordinating color from the border fabric, then using the green as binding?

TD9 is triple disappearing 9 patch. You make 9 patch then cut it apart and make it into another 9 patch. Cut it apart make it into another 9 patch then cut apart flip it around and sew it back together. On the other version I flipped the corner blocks around when adding the third 9 patch pieces. Thanks everybody for suggestions I have some thinking to do :-)

I wouldn't add anything else. It is really very pretty.

Beautiful :)