If your deck or patio is partially covered, drape lengths of fabric or canvas between the joists to create shade. Space out the pieces of fabric for a more transparent look, and add lights to illuminate the space at night.
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.