I used a [FIXED_TEMP:1] tag to make it a permanent heatsink that would sentance everything around it to an icy death. I think in the end it was a little too extreme though.
You can also set the [HOMEOTHERM:] tag to low temperatures and it should prefer them but I can't say I've ever used it like that.
The blizzard man uses a [MATERIAL:WATER:NO_MATGLOSS] tag to give it some unusual properties I believe as well.
HOMEOTHERM = body temperature. Check the wiki (www.dwarffortresswiki.net), "creature tokens" article.
There're ignite_point, heatdam_point, colddam_point, bone_ignite_point and a lot of other tokens which refer to temperature. Note that DF temperature scale is Farenheit + 9668, or Celsius*9/5 + 10000 (so water boiling temperature is 10180 and ice temperature (0 C*) is 10000.
[ May 05, 2008: Message edited by: Deon ]