I want to share two Youtube channels I really like:
MiniGirl has some really interesting tips. You know, making nerd-stuff with lady's devices and so on. But I like her Ice and Lava tutorials, I created the lava on the Tir-Na-Bor bases the way she described it.
The team from Dreamspiritwar also have some nice tutorials, especially about snow and ice.
And yes, the next gameboard will be a frozen one, and the ice bases for the Behemoth-orcs are also to be done...