what to do with red mulch

I'm dealing with the aftermath of a trespassing dump and run.   They left a cubic yard of red mulch.  This stuff is dyed with rust.  There are two types: certified and non.   Non certified is usually construction refuse whereas certified is leftovers from the logging industry.

This is certified, which means its a no toxic mix of shredded limber branches and rust.  But i don't really like it.  So what can I do with it!