Using color and trim transforms a bedroom alcove from an awkward space into a design feature. Paint the alcove's interior in a contrasting or complementary color to your walls to make it stand out as an intentional nook. Adding trim or molding around the opening frames the space architecturally, giving it a built-in look. Choose trims that coordinate with room style—clean lines for modern, decorative for traditional. Combining these steps with warm lighting completely elevates the alcove’s presence and invites functional use.