Beautiful, I like the colors.

I would use the background color for a border with no color border. I would use the purple for binding.

Lovely colors in your quilt. Let us see which border idea you choose!

Or small pink border and wider purple border. Or a flanged border. So many possibilities with this lovely quilt!

Great quilt, I might go with the white, then purple border, although Susie's idea works too.

How big are the smaller squares? I think a small white border and then a larger color border is perfect. I would make the color border no larger than the smaller square.