A 'Creative Reward' refers to a self-gifted creative project undertaken by a graphic designer or someone engaged in a creative profession. This reward is a personal incentive upon successfully completing a creative task assigned to them, especially if it's one they might not be enthusiastic about.
John had to work late into the night on a tedious logo redesign, but he promised himself a 'Creative Reward' – an hour of painting his personal art – once he finished the task.