I think C in the darker color to finish off the border would be nice.
Linny

Instead of making more blocks do the borders of light blue and dark blue. Very pretty quilt.

I like the light & dark borders

I love your quilt and think your third option is the way to go. Keep the lighter boarder narrower than the dark one. Well done.

I like a double border.

I like the last picture boarders the best!

I really like the third choice. Light narrow border then dark.

Boarders all around.

Geez! I'm no good with decisions either! But it is beautiful, I love the blues!

You are doing a wonderful job!!