I'd like to start out this guest entry by thanking Bret for the invite! I am, clearly, a big fan of his work. :)
I was there at the Idea House, I saw the whole thing, and it was jaw dropping, for sure. . . there is more to be told than there is space or time to tell it, but I'll do my best.
Basically, the house was a giant advert. If you bought ad space in Sunset, I'm sure your products were there. Case in point: The first thing I noticed after we'd driven through miles of wine country hillside - the cere, golden hills that roll across the east bay - was a strip of lawn. Now, to be fair, it was a tiny strip of lawn (cut down in size from the original plan drawn up by the architect, in fact). But this patch of lawn (10' square) was dominated by a lawn mowing robot which was about the size of a carry-on piece of luggage. Not a polite, stowed-under-the-seat-in-front-of-you carry-on either; one of those big roll on types that the people sitting next to you spend five minutes trying to force into the overhead bin that until recently contained a delicate souvenir Murano glass perfume bottle.

So, for this 10x10 patch of grass in a house they advertise as a showcase for energy saving technologies, they use a piece of equipment that costs $2500 and took oil, steel, and whatever else to manufacture as well as energy to run (no, it wasn't powered by alternative energy). If anyone out there is considering a lawn in a 10x10 patch of dirt in the dry California countryside, make it a thyme lawn - no watering, no mowing, no shopping for thyme in the grocery store.
That was only the first mistake. There was a redbud (cercis canadensis) in the middle of the entryway; cercis is a hot tree right now, but not good for hot weather - it's an under-story tree, which means it takes part shade, not full sun, and it was showing the stress; the leaves were spotted (plants do get sunburn!) and droopy. On top of that it's just way out of place in a landscape dotted with scrub. Mesquite would have been far more appropriate for the style of the house.
The hill in the back of the house was dotted with plants from Monrovia - sedum variety "Autumn Joy," english lavender, and bunny tail grasses. These are all plants that can take the conditions, but it's like going to a steak house and ordering a hamburger - they went with Monrovia, perhaps the most expensive dealer on the market - and they bought plants that you could get at Home Depot, or start yourself from seeds and cuttings. On top of that, the plants were planted recently - in the heat of summer, no rain to come. Even drought tolerant plants will die in those conditions - and thats what they were busy doing when we saw them. See below:

That's nothing, though, compared to the plants that weren't even alive to begin with - plastic agaves dotted the interior.
The biggest travesty, though, was the rubber mulch. Mulch is, traditionally, shredded or chipped wood or other organic matter which is spread over the soil in a planting bed. The purpose of mulch, so you know, is to retain water in the soil by preventing evaporation, and improving the quality of the soil as the mulch decomposes and is worked into the earth by heave and worms.
Rubber mulch, on the other hand, is made from old tires. Its purpose is to look ugly. A lot of people think rubber mulch is a great idea. "Won't decompose!" the ads read. Only too true. Heave and earthworms work it down into your soil and there it sits for pretty much ever. You are not improving soil quality with rubber mulch. You are littering.
I think I'll leave off there. I could go on but I won't. This is, after all, a guest entry. We'll see if I'm asked back. :)
Thank you again, Bret!