Okay,  let's make it simple about applying bump to anything.  1) Open bryce and create a sphere.  2) click the "m" beside the sphere u just created and should still be selected (mesh is red)  3) this takes you to mat lab.  4) click a space beside "bump" and a bead will appear there and a random texture will appear in the window.  5)  click the top right triangle button on that newly appearing window and a menu will pop up with myriads of textures in the library.  see screen shot.