static readonly int[][] locations = new int[][] { new int[] { 337, 104 }, new int[] { 443, 104 }, new int[] { 549, 104 }, new int[] { 655, 104 }, new int[] { 761, 104 }, new int[] { 337, 210 }, new int[] { 443, 210 }, new int[] { 549, 210 }, new int[] { 655, 210 }, new int[] { 761, 210 } };

        protected int[][] getRandomLocs(int[][] locs)
        {
            Random rnd = new Random();

            for (int i = 0; i < locs.Length; ++i)
            {
                int next = rnd.Next(locs.Length);
                int[] temp = locs[next];
                locs[next] = locs[i];
                locs[i] = temp;
            }

            return locs;
        }

        private void Form1_Load(object sender, EventArgs e)
        {
            int i = 0;
            var temp = getRandomLocs(locations);

            foreach (object item in this.Controls)
            {
                if (item is PictureBox)
                {
                    ((PictureBox)item).Location = new Point(temp[i][0], temp[i][1]);
                    i++;
                }
            }
        }