Here is quite an enchanting photo of the Rexburg Idaho Temple.
The newspaper, Upper Valley LDS Life(January 2008) carries a little different slant on Rexburg Temple art. Scott Samuelson, a long-time Brigham Young University-Idaho English professor, has been working on a series of contemporary watercolor portraits of the temple.
He says,
It has helped me come closer to the temple. They were building the temple and I was building the temple in me.
I don’t know quite how to take this statement. But Scott’s show, “which is entitled ‘For a Sanctuary: Temple Celebration Paintings,’ will feature 24 of his recent paintings. It will run Jan. 24 to March 6 in the east wing of the McKay Library on the BYU-I campus.”
Things are really gearing up in Rexburg, Idaho. The Rexburg Temple Celebration will be February 2. Over 2,000 people are preparing for this event. “The underlying theme of the program is based on a scripture from Section 101, verse 65, of the Doctrine and Covenants that states: ‘Therefore, I must gather together my people, according to the parable of the wheat and the tares, that the wheat may be secured in the garners to possess eternal life. . . ” This fits in with the wheat motif in the Rexburg temple.
I know what the Bible says about wheat and tares. And I fear what happens to the tares. They get sent to the fire.
Another article featured Sharon Bell of Rexburg, who “stopped by the temple almost every day to watch its construction. She has three binders full of photographs.”
But the most interesting article is the extensive interview with Leon Parson on painting of the murals.
May I be honest with my LDS friends, tonight?
I think it is ten times more exciting to hang out in the instruction room with all the life-size aspens, cottonwoods, willows, pines, sage, whitetail, mule deer, elk, great blue heron, mountain bluebirds, and ruffed grouse than staring at chandeliers in the celestial room.
But of course, I am just an Idaho spud.
Jesus in Idaho Falls 
Nice site here, and thank you for engaging the LDS. I have recently posted something over at my blog and on the similarities between Islam and Mormonism, which you and your readers may find interesting:
Islam and Mormonism
Well, the Celestial Room has a different purpose than drawing attention to itself. It’s a place for peaceful contemplation and prayer. It would actually be a drawback to me if the surroundings there drew attention to themselves or entertained or stimulated. After all, I don’t enter that room to be wowed by the arm of the flesh. I go there to commune with God.
The temple is a symbol of a bit of holy space that we are supposed to create within our lives. An inner sanctuary against the surrounding darkness, confusion, and distraction in society. I imagine that this is what the artist meant.
In the SLC temple, where attendees move from room to room as part of the ceremony, this concept is made more clear: the first rooms have you on earth, surrounded by its beauty; the celestial room is brighter (lighting) and without the beauty-of-the-earth motif (yes, there is a lot of ornate work, goldleaf, etc., but the symbolism is that you are no longer focused on the earth). I like the symbolism: we came here to be grateful for the earth but set our hearts on heaven.
Before the Salt Lake temple was completed in Salt Lake the endowment ceremony would be conducted on Ensign Peak, so your wilderness temple is not that far off.
But I agree with Seth R. that although beautiful and of high quality workmanship, the celestial room of an LDS temple is really not about the decorations. The celestial room becomes sacred in the context of the entire endowment. Another element of it is that the temple experience is primarily an experience of the mind, a “house of learning”, so the culmination of the celestial room is that pinnacle of peace. The surroundings progressively mirror the experience of the mind as brianj referred to.
I will say that one of my favorite things about living in Utah was that I could be in the temple in the morning and out among the trees and life in the afternoon. I think the temple experience has enriched the experience I am able to have when I am out in nature.