evil.rake

    desc "Duplicates images from all app/assets directories"
    task :cache_images_for_development => :environment do
      image_paths = Rails.application.assets.paths.select {|path| path.ends_with? "/images" }

      image_paths.reverse.each do |path|
        Dir.glob(File.join(path, "**/*")) do |file|
          puts file.to_s.sub(path, '')
        end
      end
    end