I just installed can lights in the ceiling, replacing a hanging light. That leaves me with a live 4" round box in the ceiling. Code won't allow me to conceal it or mud over it. The ceiling is drywall with hand-troweled ripples. What can I do to cover this live box that will look nearly invisible yet still stay within code? For example, do people trowel drywall compound over a cover-plate before screwing it in place? What else do you recommend? Thanks!