Using noise is a way of adding another aspect of realism to objects. Normally you can prepare images ahead of time and use those in your css to create this effect, but for some procedurally generated things images can't always be used. That's where something like this would come into play. While the use case for this over precomputed images is quite small, it's nice nonetheless to have.
Aside from sites styles though, it's also a fully functional noise implementation - which could be ported to web based photo/graphics editors.
Aside from sites styles though, it's also a fully functional noise implementation - which could be ported to web based photo/graphics editors.