Pete,
this gets my vote, The 'unknown wood' base, being unworked and washed out of colour really sits well under the vase. If it had been worked or more coloured it would have detracted from the overall final appearance, to it's detriment.
Mark always adds something, stones, I don't see them here, but I do see something more organic in the dished area to the front - nuts, hazels or acorns - no idea why, it carries well as it is, but you might try a few strange items, if nothing else as an experiment.