Use tapestries or curtain panels that coordinate your room's decor to cover the cracks. The shape of a vaulted ceiling works well to display hanging art such as tapestries or batik curtains.
Create an even pattern with the panels so the effect looks intentional. For example, hang a tapestry every 6 to 8 feet, not just over two big cracks.
Secure both ends of each curtain panel or tapestry with clear push pins or use a staple gun. Tack the fabric with either method every 4 to 6 inches to hold the fabric securely.
Apply drywall tape to each crack in the vaulted ceiling. Take care to press the tape flat to avoid air bubbles or creases.
Use a wide brush to cover the cracks with latex spackling. Allow the spackling to dry overnight or for a full day, depending on humidity.
Paint the covered cracks with paint that matches your ceiling. Keep the windows open for ventilation until the paint dries.