With your glass table I think a large piece of glass or silver sculpture would be stunning, but sorry to say I don't think that would go with the chandelier.
Maybe a collection of mercury glass vases and candlesticks.[houzz=]
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On long glass tables, I usually add three cylindrical vases and fill them with unusual shaped and coloured objects... sponges, coral, interesting seed pods etc... I line them along the center of the dining table. Glass on glass is very effective

I like the mercury glass idea...

Find a long, thin (4-5 inch diameter) log with a smooth surface. Paint it silver and lay it on the table. It should be a bit bent and nubby to bring some "organic" into the room. Don't worry, the silver (or gold) will give you your bling!

This is as close of a photo I could find. http://houzz.com/photos/693062

I think this elegant and a complete 180 from my previous suggestion.
http://houzz.com/photos/342574

A mirrored runner with beveled edges could be bought for the center of the table , and a Large oriental bowl on a nice wooden stand that would have the colors in your chairs would pull it all together . Inside the bowl a few nice large round balls or spheres that are mixed , for an organic feel . think about , Round balls made out of grapevine , a few round balls that are moss covered , maybe even a couple of beautiful pine cones .