Crossed my fingers and hoped for the best...
Silver metal - mithril silver, wash in devlan mud (liquid skill)
Bronze - shining gold, wash in devlan mud
Wood - snakebite leather
Grain - taupset ochre, bleached bone, wash in devlan mud
Base - scorched brown, highlight bleached bone, paint snow areas with white, glue, dip in gw snow (kinda sucks though...)
Bricks - chop up a sprue, shadow grey, spacewolf grey, same process as the base for snow.
Hope that helps, good luck!