"In that case it won't do for my purposes as I need a uniform result" Hmm, in that case, just radial blur the black/white noize but don't apply any faux-shading with, it will then be flat-shaded. Then Bryce's material properties can be used to effect the specularity, reflection, etc. You may also be use it as a bump map for the same texture (but the strength would need to be very low).