First right click on the pictures in the post and save the first as chainbump and the second as chaintrans. Go into bryce materials and select a metal texture.The one shown is brushed pewter. Click on the little bumps in the B column of the material lab for transparency and bump. This makes the little three box window come up with a random parametric texture as default. Click on the little P button next to the T. Click on the red button above the P button to open the Picture texture window shown above the materials window. Load the chainbump into the first box of the picture window. Load the chaintrans into the second window. Click on the little triangle in the Materials window and check the Blend Transparency window.. If you apply this material spherical at a scale of 50% it works better than parametric.