When it appeared on the runway at the Louis Vuitton show in October, who could have believed that the fantastical footwear — selling at €1,250 to €2,250 (about $1,650 to $3,000) a pair — could be the hottest item for summer 2009? No wonder that the designer Marc Jacobs baptized it the “Spicy,” giving a name to the shoe, as had previously been the custom with the now-fading It bags. To spice up this footwear, the designer added everything but the kitchen sink — as long as it was out of Africa.