I have an idea that incorporates steampunk into the frost dimension without messing the natural beauty or theme.
The music should probably be something light and mystical. Perhaps these instruments, , playing a remix of classic minecraft music? Anyway, the music would be common throughout the dimension to reinforce the beauty of the natural world.
But every now and then, you would find a different island filling the gap in the floating islands (are we going with floating islands?). These would be Steampunk Stations (name WIP). These giant, dark, structures would greatly contrast the bright frosty world it surrounds. The closest thing I could find to what I'm thinking.
Inside the huge stations would be a labyrinth of passages, filled with evil robots and useful gadgets. To differiante it further from the rest of the dimension, these dungeons would have its own, drum heavy music, resembling this.
Thoughts? I feel that this might be the best way to add the two most popular suggestions so far into the dimension while keeping a cohesive theme.
EDIT: Well I guess text video links don't work.
I'd think it would be better to have a predominantly dark steampunk theme with a bit of etherealness to it.