I have always enjoyed getting down to the basics and understanding how things work, and one way in which I like to do this is to get out in the woods and wilderness and learn primitive methods of making and doing some of the things we take for.
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.