Attached Link: http://www.weirdass.net

Get a photo of some coral outcroppings, grey it down, save a jpeg, click a new lattice into the sceene. set it to some insane res like 512 or 1024, import the jpeg, noodle with it and then clip the black edges. If you get it right, there's no seam. Also, use the original image as a mapped on image texture. Works with rubble as well. Mitch