You also have a few options when it comes to the shape of coffee table sets. One of the most common shapes is a long, rectangular coffee table and square-shaped end tables. These look great around a classic sofa setting, where you place the coffee table in front of the sofa and the end tables to each side of the sofa. Square end tables also look great next to chairs.
It's also common to find round coffee tables and end tables. These look good around shorter sofas, since the round coffee table doesn't cover as much space lengthwise. Though if the coffee table is more oblong, you could use a longer sofa style. Round end tables can also be placed anywhere more easily, since they don't have straight edges that make them look like they should be placed alongside something.
Some sets have a little more diversity in shape. You might have a square coffee table, a square end table and a rectangular console table. In this case, the coffee table goes in the center of a sitting area. The end table can be next to a chair or sofa, or off against a wall. The console table looks best when placed against a wall.