An attractive Gantt chart color scheme can enhance readability and visual appeal. It typically involves using a consistent color palette to differentiate tasks, milestones, and dependencies. Choosing colors that are easily distinguishable and not too bright or contrasting is key. Some popular color schemes include using shades of blue for tasks, green for completed tasks, and red for those that are behind schedule. It's also important to consider color blindness and ensure that the colors are distinguishable to all users.