belfast sinks

I have an old belfast sink which sits on gravel and filled with heathers. The exterior is white and chipped and looks unsightly. I have heard to can cover it with a mixture of concrete and something else to give an aged and rustic look. Can anyone help please? Thank you.

 

I am fairly sure this is peat, not sure of the mix quantities though, and you might have to roughen the surface a little to get it to stick

 

here's one method

http://www.homeandleisure.co.uk/_diy/how_to/gardering/gardening_35.shtml