a border for Rowan's Birch?

In order to keep me occupied while waiting for my beads to come (I have already swatched my cashemire and it is lovely), I have finished my very old Birch. It had been waiting very patiently in a lovely bag since ages because I was not happy with its size.

I don't know what we have been thinking while trying to figure how many stitches I should cast-on to be sure to finish a smaller birch with only two balls of rowan's kidsilk haze, but we may have to considerably lower our self-esteem in math.
Both me and my very clever man.

My Birch is tiny. She didn't even used a full ball.

Of course I may not frog this yarn. So I thought I may add a border to my shawl. Does anyone knows a nice border with a leaf motif? Not to complicate to compliment the simplicity of Birch? And if you have some advice on how many stitches to pick-up and knit for a sided border in garder-stitch,. I would be grateful. With any advice, actually.

If you want to get an idea of how she is looking, I have found a similar one at Sweet Georgia's. I hope she doesn't mind if I give you here a tiny link direct to her photo.
Thank you very much for your help!
Now I am leaving you, because a girl has to sleep sometimes too.