Yes, yes, I have.  In college I dyed it blue, purple, red and green then finally black when the green faded to a lovely dead-seaweed color.  Been dying it black since then, so for about 13 or 14 years.  From what I recall, it is naturally a medium brown.  Mouse brown, as my mother called it.  
	
		
			
		
		
	
				
			
				
