A bud vase filled with water, a wide flower (real or silk), and a small tealight. This looks like spring or country-simple, but you can do whatever flower you want (and tealight) as long as it creates a wide enough base for the candle.
Pretty, pastel-coloured retro wooden ladders like this have multiple uses at a wedding reception. Use the different levels to display details, or perhaps even your table plan? This quirky arrangement with flowers, bir.