Decorating inaccessible under-stairs spaces safely means prioritizing low-touch, low-maintenance elements to avoid hazards. Use objects serviceable from the stair edge like a mirror that multiplies daylight, a standing plant on a pull-out tray, or a small pet lounge. Avoid clutter or large furniture that needs deep cleaning or frequent access. This approach preserves safety and serenity while adding personality without blocking light or creating tripping risks.