No ideas for the center. For outer borders, could you add a skinny border or two, then a wider border to give you the length you are looking for-??

Your design looks fine. Usually there is an odd number of strips so there should be a center strip like this. If you need more length than just add strips to both ends.

That is beautiful maniac! Hopefully the OP can follow your suggestion to add to hers-which is also very pretty!

If you have more of the green fabric, I would add it in the middle. With quilting maybe stippling you will not need a actual pieced block but could use a solid piece of fabric. With the green, I think the pattern on each side would radiate from the center. If you hVe to piece maybe start with dark green in center strip and move out to lighter green colors. Let us see the finish!

You might try getting out graph paper and experimenting with some of the ideas offered. If your mil's table isn't really long, once you add your borders, you may find you're not going to need any more length. Good luck. Your table runner is beautiful. Be sure and share your finished runner. I'm anxious to see it.

It could look cute doing the alternating you suggested. The other thing I thought was just adding 1-2 blocks in the center with straight lines of the last color from the outer pieces going across.
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This is what I did. It is only slightly awkward.

I think your solution works nicely. Very pretty.

I don't think it looks awkward at all!! In fact, I'm quite impressed with your solution.

You probably aren't satisfied with it because you had an image in your head of what it should look like. I think your final product is super and I'll bet your MIL will too. It was a "design choice"!!

And add to that: Now it is Unique! And Beautiful!