prawn：Prawn::Table :headers, :align_headers, :header_text_color, :header_color

everyday Ruby 
#!/usr/bin/env ruby

require "prawn"
require "prawn/layout"

data = [["Gregory----------","Brown----------"],["James","Healy"],["Jia","Wu"]]

pdf = Prawn::Document.new

pdf.table data, :headers           => ["First Name", "Last Name"],
                :align_headers     => { 0 => :right, 1 => :left },
                :header_text_color => "ff0000",
                :header_color      => "00ff00"

pdf.render_file(File.basename($0, ".rb") + ".pdf")