Lululemon knows it has lost its surprise factor. On an earnings call on Thursday, CEO Calvin McDonald said that customers are not responding well to new colors and some products have gone stale."I now believe we have let our product life cycles run too long within many of our core categories, particularly in lounge and social," McDonald said. "We have become too predictable within our casual offerings and missed opportunities to create new trends." McDonald added: "We did not have the appropriate balance ...