I like the suggestion of modern metal drum tables but have practical concerns. Where do you put a lamp? These tables are small. Maybe one metal drum and something else that could hold a lamp? Or should I look at floor lamps?

http://coreymorganwoodworks.com/projects/live-edge-walnut-extension-table-with-trestle-base/ Can you have an extension table made? There are plenty more examples when you google, incl. one like the one envision.

Something simple and elegant that won't detract from the beauty of the table.

If you have a "live edge" (very dead tree) piece of wood, it usually means the board was originally cut with bark on an uneven edge. Wouldn't, just wouldn't want that look for furniture. Some people, however, do -- and pay a lot of money for that look. To each his/her own. My brother in law had a sawmill before he retired. He had a board with a bark edge that very much had the shape of a fish and he hung it up as that -- as art. That uneven edge look -- with or without bark -- can accurately be called a "rustic" look. Heavy clunky painted white chairs could work with that. Smaller, more fragile looking white chairs are less likely to be a good fit.