The following is in no particular order.
The point here is not that one should heat ones house with a wooden stove or build an adobe or even that one might build the main level of the house such that 1/3 of it is below the ground, although one might do any of these things. The point is that these ideas have real merit and are not hard to implement if one wanted to and designed it in from the beginning.
17. One of the odd triumphs of S. California was the Arts and Crafts Movement of the early 20th century. One might consider recreating some of their designs or setting up a workshop to do so on site or in some way to feed into your house construction.
18. One might research current artists and workshops capable of creating decorative stone or bronze work. And select an artist or two to work from their workshop or at a workshop you create to feed decorative elements into the house. If one did create frescos one would need to find artists capable of working under those very wonderful and strange constraints (the key to a fresco is to paint it while the plaster is wet, and essentially without making any mistakes).
20. One could set up to do bronzes with the lost wax method but use 3D printing (there I go with these modern techniques again) to create the molds.
21. One might want to create and store spare parts for the house from the very beginning. It would be easier to make spare parts, tiles, sculptures, etc while the workshops that are creating them are building things for the house and just put them underground and wait the 10 or 20 or 50 years until they need replacement.
22. If you do use concrete, recall that Roman concrete is better than Portland cement and that there should be a discussion here.
23. If you do build mosaics, consider designing them with a computer and using some sort of automatic stone cutter or even 3D printer to create elements. Remember a key to a mosaic is longevity, so it might be better to automatically cut stone or tile than to print with modern materials.
24. When working at Robert Abel & Associates, I would often walk down Romaine to visit Opamp books, which is now out of business after a long decline. On the way there I would pass a building that was a ruin, uninhabited, that fascinated me. At some point I noticed some sort of ironwork railings, and older leaden glass in the windows. I eventually discovered that this was the old Hollywood headquarters of Howard Hughes in the period when he made movies. The older glass was fascinating. Consider using handmade or leaden glass, even consider stained glass. Glass does not have to be boring.
25 A carillon is a series of bells, usually played by a kind of keyboard that is below it, that has at least 24 bells or three octaves. A chime is the same sort of thing but with at least one octave or 8 bells, but not as many as a carillon. There is a famous chime at Hollywood Forever but it is not playable and would need restoration. Maybe you can buy it? I have always wanted a carillon! See https://en.wikipedia.org/wiki/Carillon
[By the way, if you look closely at the bells above, you will see that there is type extruded on the surface. Do you have any idea how hard that is to do? Its amazingly difficult if it was put there as part of the pouring process, which I think it must have been. This was an aside.]