Maple trees are the embodiment of fall foliage. So-called "leaf peepers" in North America drive hundreds of miles in October to places like the White Mountains of New Hampshire to marvel at the colors of these special autumn trees. I tell you about some of the best types of maple for fall color here: http://landscaping.about.com/cs/fallfoliagetrees/a/fall_foliage7.htm
Manihot grahamii / Hardy Tapioca / Graham's Cassava: a native of Eastern South America, from Brazil through to Argentina. I've done a quick web search and this has been successfully grown as far north as North Carolina. (This photo said it was taken in the Pacific NW).