I agree with IrishRose. If you can add a tiny border (or flange or piping) of a different color, that would be ideal. You could try to match it to something in your print, or you could pick a neutral like beige or black, or you could go with a direct complement in an indigo-violet. Just something to break it up a bit. Once you've done that, I'd probably pick the yellow border to make it look more warm & cozy. The white makes it look more cool & crisp.

***
*** yellow
***

I like the white better.

I prefer the yellow. However, what about doing a total of 3 borders: a 1" white and a 2" yellow or vice versa, then the green border.

I vote yellow. It has a softer appearance.

Yellow looks best.

It needs the yellow for zing!

I like both. I don't think it will make a big difference which you do. Have you thought of two thin borders one of each?

I say white!

I prefer the yellow. It seems to flow better.