[рони]

в три разных блока

var block_img = document.querySelectorAll('.block_img img');
var block_image_show_one = document.querySelectorAll('.block_image_show_one');//блоки
block_img = [].slice.call(block_img);
for (var i=0; i<block_image_show_one.length; i++)  {
var rand = Math.floor(Math.random() * block_img.length);
var arrImg = block_img.splice(rand,1)[0];
if(arrImg)block_image_show_one[i].appendChild(arrImg);
}