GENIUS…Line a pathway with rocks painted in glow in the dark paint. During the day they “charge” in the sun and in the evening they reflect the stored light. Rust-Oleum Glow in the Dark Brush-on Paint.
Cobblestones - Lay it Down: A Guide to Landscaping Surfaces on HGTV | Cobblestone is a durable, inexpensive choice that comes in an array of hues. Set the cobbles on a bed of mortar, then brush a dry mortar mix into the joints for a hardwearing surface. Use only smooth rounded stones; others are hard to walk on.