Black makes a great decorative gravel with its rich black colour particularly when wet. It can be used as a non organic mulch in flower bed and will not rot down like mulch so is a long term solution.
Great for windier areas where mulches blows away.
Its angular finish makes it a stable gravel to walk on rather than the rounder gravels
Weed mat can be purchased to stop weeds growing from below.
It also can be used to create paths or driveways or in water features.