Kobe Bryant was purple and gold as a 13-year-old -- signing his middle school friend's yearbook with "How bout those Lakers" -- and now the book can be yours. Iconic Auctions has the super-unique piece of memorabilia on the auction block ... and it's pretty amazing. In 1992, Kobe -- who just returned to the U.S. from Italy -- attended Bala Cynwyd Middle School in Pennsylvania ... where he played on the basketball team.