Very easy to make, here what do you need:
a stereofoam ball and a sereofoam cutout, you can use the inside theball if you want to carve it, or a random piece of foam like I did.
Cut the ball in half, do not worry if it looks small, real igloos are.
Draw the blocks with a pen or other sharp object.
Now take the small piece of foam, round and shape a bit.
Make a little slot for it on the main body and glue it.
It is basically done, as base I used a pressed cardboard coasted.
Now you can paint as you like.
I basecoated it gray, whashed cyan, blue on the recesses and drybrush white for last.
Some creatures for size.