Lighting embedded within a stair rail. The light switches for it could be buttons on the ends of the rail.
LED ribbons integrated into stairs. Late at night, the stairs can be lit (and safe) without ruining your night vision with bright overhead lights. Would also be a great way to really highlight a gorgeous staircase. @ Home Renovation Ideas
Square handrail for steps Rocky Mountain Hardware Stepped Handrail Bracket
Stair case - board & batten, railing but would prefer white