gistfile1.clj

(.setDefaultRenderer table Object
  (proxy [javax.swing.table.DefaultTableCellRenderer] []
    (getTableCellRendererComponent [tbl obj isSelected hasFocus r c]
      (let [{:keys [level]} (nth rows r)]
        (doto this
          (.setForeground (cond
                            (<= level  0) Color/white
                            (<= level 10) Color/blue
                            (<= level 20) Color/red
                            (<= level 30) Color/magenta
                            :else         Color/black))
          (.setText (str obj)))))))