Very important. Accent pillows add so much to any lounge especially when using pillows with prints, patterns and colors. Renting accent pillows can enhance the final look of the lounge and make it feel complete. The picture below shows an example of using a lot of pillows to create a cozy feel.
150th UBS anniversary during Art Basel 2012
It's also a great way to communicate the concept of the event by for instance, renting pillows that match the company/event logo or making custom pillows with matching prints.