Minimal::Template is an experimental, minimalistic templating engine inspired by Markaby & Erector but much smaller (~55 loc) and targeted at Rails 3.

# views/foo/bar.rb
module Foo
  class Bar < Minimal::Template
    def to_html
      html do
        head
        body do
          h1 'plain'
          p  local
        end
      end
    end
  end
end

# somewhere else
view = ActionView::Base.new('path/to/your/views')
view.render(:file => 'foo/bar', :locals => { :local => 'local' })

# => '<html><head></head><body><h1>plain</h1><p>local</p></body></html>'