How to style a shelf like a boss- Choose a color scheme, layer shorter things in front of taller things for depth & complexity. Use books as pedestals, vary height & you can group them facing in or out. Start with Largest items first & disperse them evenly, then med & fill in with the smallest.
How have I never heard of this? A neat, straight paint line at the top of a wall is tough to achieve next to a bumpy ceiling. So before you paint, drag a narrow flat-head screwdriver lightly along the ceiling. You'll get a clean paint line and no one will ever notice that the bumps are missing.