PLATINUM. PLATINUM EVERYWHERE.
And my glacial dorf fort is working out well. A yeti got in and was swarmed by seven angry pick swinging dorfs. I did fastdorf it to get things done quickly due to my limited food supplies.
It's a shame ice can't be used to make furniture...
EDIT: Autumn has come and my surface fortress is to my liking, if short a few components. Thanks to three unlucky elk birds I have bone crafts aplenty to buy out the home caravan.
Also, trogs seem to be filling up my cage pile, so I've deployed the founders to supress this evidently large tribe of trogs. The presence of a troll leads me to think that the troll caught wind of us and is coercing the troglodytes to fight under its own banner, trying to use up our cages by sending endless waves of trogs at the cavern entry so it can attack directly.
As the founders are all miners, this will be quite the messy brawl.
"Miners of Glacialhell! You first struck ice, then struck stone, now I call on you to strike down the enemies of our fortress in the underworld! Go forth brothers and sister, and conquer!" - The expedition leader of Glacialhell.
Oh, and I've begun displaying our yeti on ice columns ourside the walls, killed a pair of thieves, and caught some other elk birds and a giant mole, so theres that for food if we need it.
EDIT II: Ok, so killing the troll may have been a bit stupid. The 2nd cavern layer (I sent the miner auxillia down to clean out anything that might be down there) flooded with troglodytes. And all the came to mind was the commander shout "THERE COMRADES!!! MORE COME TO DIE!" as he sighted the troglodyte hordes.