What is the collective noun for graffiti?

There isn't a commonly accepted collective noun for graffiti.

You could use a more general term like:

* A collection of graffiti

* A display of graffiti

* A series of graffiti

* A sprawl of graffiti

Or, you could be creative and come up with your own!

Here are some possibilities:

* A scrawl of graffiti

* A blitz of graffiti

* A riot of graffiti

* A tapestry of graffiti

Ultimately, the best term depends on the context and the specific type of graffiti you are describing.