Go to your presets folder. Then your materials folder. Select the 'user.mats file and copy it to somewhere else. Rename the user.mats to 'metals.mat or something else. Paste it back in your presets/materials folder. Open Bryce and the materials drop-down. Delete the .mats already there and replace them with the metal .mats you want. There you go....

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All the Woes of a World by Jonathan Icknield aka The Bryster

And in my final hours - I would cling rather to the tattooed hand of kindness - than the unblemished hand of hate...