download.rb

#!/usr/bin/ruby
require 'humanize'
require 'open-uri'

(2..99).each do |number|
  filename = "map_marker_#{number.humanize.gsub('-', '_')}.png"
  url = URI.parse URI.encode("http://chart.apis.google.com/chart?chst=d_map_pin_letter&chld=#{number}|FF776B")
  open(filename, 'wb') do |file|
    file << open(url).read
  end
end