I don't know about you, but I always get pretty excited when I find something neat on the ground. Part of that is because it doesn't happen very often as the streets I walk will either have essentially nothing on them or just some bits of trash.
But sometimes, a little something will shine out from the same boring scenes and attract my eye. Even if it's not something that I would necessarily find useful, it just feels nice to find something different.
And while I doubt that many of the people on this list will find much of a purpose for what they found, we can definitely describe their discoveries as "different."