module MyModule
  module ClassMethods
    def modularize(opts = {})
      @opts = {:foo => "bar"}.merge opts #set defaults
      attr_reader :opts
    end
  end

  module InstanceMethods
    def opts
      self.class.opts
    end
  end
end

class MyClass
  extend MyModule::ClassMethods
  include MyModule::InstanceMethods

  modularize :foo => "jitsu"

end

MyClass.new.opts