"Though there were manufacturers in several parts of the United States, the great preponderance of commercially-made aluminum trees were created by the Aluminum Specialty Company of Manitowoc, Wisconsin. When their 'Evergleam' line debuted in 1959, many embraced the shiny trees as an expression of the new Atomic Age. The trees appealed to a Jetsons-style notion of modern living where life was clean, automated and easy; with an aluminum tree, needles never fell, it could be stored compactly and re-used every year, with none of the fuss of a real tree." Etsy: History Lesson: The Aluminum Christmas Tree, by Jeni Sandberg. [more inside]
War is Boring's Steve Weintz has a two-part article up on mobile nuclear reactors, called Atoms In Motion: Portable Reactors (part two here). The links referenced cover planes, trains, and automobiles (though calling the last one an "automobile" might be stretching the definition a little.)
Roto-Spheres were dramatic animated neon signs, with 16 spikes projecting from a central ball; the left and right hemispheres rotated in opposite directions, and the whole thing rotated as well. Only 234 were made, and not many are still working, but despite their rarity, they are somehow instantly recognizable as the ultimate signs of the atomic age.