WIP Wednesday: Is it finished?

 Every time my design wall is empty, I pull out my liberated medallion quilt from last April's Gwen Marston workshop. Here's where it was after the workshop ended:

I made a row's worth of wonky X blocks about 8 months ago but didn't attach them. I was trying to decide if I should do the X blocks on all four sides or just on two. I'm not usually a fan of square quilts, so I wanted to try making it rectangular. Here's a rough layout of that attempt:

I didn't like it, though, so I kept making wonky X blocks so I had enough to go around all four sides. I sewed them (and the red border) on and then started auditioning what would come next. I really liked this dark brown border:

And ultimately decided to sew the brown borders on without any additional piecing, using teal cornerstones. So this is where the quilt stands now. It's 40-ish inches square.

I think it's done.
Except...
I really don't want it to be. I want to keep going--I love the palette, the fabrics I have, etc., and I was envisioning using this fabric (which goes so well with the rest of the fabric) as a wider border as the quilt grew:

But the same time, I don't want to ruin a good thing by trying too hard. I can always start another liberated medallion, right?!?! :)
What do you think? Stop with the brown border (and use the Kaffe fabric as backing), or play around with growing this quilt?

Linking up with WIP Wednesday at Freshly Pieced