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Set random metadata for blocks on load?


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I'm using metadata to give grass blocks a random texture index.  So far I've managed to get this working using 'onBlockAdded'.  However I would need the metadata value to be given to existing blocks in the world ( when world is loaded?) , not just ones that are added.  How would I go about doing this, or is there another approach I can take?

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Thanks, I will take a look at the event. 


I potentially have another way of achieving what I'm trying to do but I have one issue.  How do I reference 'the world' in a Block class?  I'm trying to retrieve the chunk in which a block exists using this line :


public int getBlockTexture(IBlockAccess iBlock, int x, int y, int z, int side)
    	 Chunk chunk = Chunk.worldObj.getChunkFromBlockCoords(x,z);


However 'Chunk.worldObj' throws up the error “Cannot make a static reference to the non-static field Chunk.worldObj”



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