DIY glow in the dark stepping stones. 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.
Mix up texture and colour in you hard landscaping This will be for a cutscene where they are both walking in each others direction along a crowded pavement, and when they walk past each other, they don't even notice each other, and just walk pass.