Continue the narrow planks in the same wood that you have, and stain them all the same color.

Check out the pictures i just added.

I still say continue what you have.

If you can match the existing, that’s ideal. We have a century-old home where that wasn’t possible, so opted to do Marmoleum in the kitchen and transition to the wood. Aesthetically it works fine (though for other reasons I wouldn’t do Marmoleum again—but tile or another wood would have worked too).