Here are some design notes when it comes to modern pergola designs. The most common pergola design is to have decorative and somewhat rounded ends on the beam. The easiest way of creating a more modern pergola is to do away with the decorative ends.
Mason Jar Lanterns Hanging Tea Light by TheCountryBarrel on Etsy - easy DIY! Small chain link, mason jars, decorative nonflammable filler and candles! Tap a hole with a nail for the chain to attach to the jar lid. And done!