Rails 3 ActionView override for Foundation 4 field error styles.

application.rb

class Application < Rails::Application  
  ActionView::Base.field_error_proc = Proc.new do |html_tag, instance|
    html = %(<div class="field_with_errors">#{html_tag}</div>).html_safe
    # add nokogiri gem to Gemfile
    elements = Nokogiri::HTML::DocumentFragment.parse(html_tag).css "label, input"
    elements.each do |e|
      if e.node_name.eql? 'label'
        html = %(<div class="clearfix error">#{e}</div>).html_safe
      elsif e.node_name.eql? 'input'
        if instance.error_message.kind_of?(Array)
          html = %(<div class="clearfix error">#{html_tag}<span class="help-inline">&nbsp;#{instance.error_message.join(',')}</span></div>).html_safe
        else
          html = %(<div class="clearfix error">#{html_tag}<span class="help-inline">&nbsp;#{instance.error_message}</span></div>).html_safe
        end
      end
    end
    html
  end
end

your_controller.css.scss

// Place all the styles related to the YourController controller here.
// They will automatically be included in application.css.
// You can use Sass (SCSS) here: http://sass-lang.com/

form .clearfix:before, form .clearfix:after {
  display: inline;
}

Note that this wraps labels and inputs in their own <div>'s. This is fine for my project, YMMV

This helped me out a bunch, thanks!