How do you make a 4,167-square-foot, five-bedroom home functional for just one person? That’s what a bachelor returning to his native Austin, Texas, tasked interior designer Shannon Eddings with accomplishing after he found a classic 1980s home steps from a beautiful hiking trail. “It was a very different experience working for one person who would be living alone in such a large space,” says Eddings. “Our client loves color, pattern, the 1970s, and music, so we took that into account when creating the interior decoration. He also has a penchant for English eclectic design, which is basically my middle name these days. I can’t get enough of the quirky, colorful…