Filed under: Industry, Consumer experience, Competitive strategy, KB HOME (KBH)Home builders are in trouble. Wall Street just has to look at stock prices for Hovnanian (NYSE: HOV) and Beazer (NYSE: BZH) to see that they and their peers have lost half of their value in a year.But, builder KB Home (NYSE: KBH) has a bit of a secret weapon. Its homes, designed in part by Martha Stewart, are still selling relatively well. The Stewart homes are only 5% of KB's sales, but as The Wall Street Journal points out : "From March through June 15, the two Martha Stewart developments alone drew 42% of the people who visited KB's 22 subdivisions in the Atlanta metro area."Some buyers, it seems, want the homes because they believe that Stewart signifies ...