Most of the time my first thought is to build a evil lair into the side of a mountain, but if you want to shake this up a bit you could make a nice glass mountain house instead!?
We started on the ground by building a spiral staircase that leads all the way to the top of the mountain. Using wood on the walls looks fine, but a white material definitely looks a lot nicer. Glow stone lamps can then be used to break up the white walls and also provide light that looks a bit more modern rather than having to fill the place with torches that don’t always look the best when going for a more modern design.
Once you feel you have built you stairs high enough start digging out toward the edge of the mountain. A wooden floor with white carpet helps keep the modern clean look, but will also prevent you being able to use furniture, so a combination of white wool blocks and wooden blocks will still give the same look, but will allow you to place things around the building. Doing this will prevent you from being able to hide lamps below the carpet, so decide what works best for you and go with that!
Once you have the glass walls built on the outside there isn’t much left to do. You can take the idea and go wild with it building a much bigger creation. It sure makes for a nice view and at night time it looks pretty cool from the outside.