_field.html.erb

<div class='form_element'>
	<div class='box'>
		<%= label %>
	</div>
	<%= element %>

</div>

custom_form_builder.rb

class CustomFormBuilder < ActionView::Helpers::FormBuilder
	helpers = field_helpers +
	%w(date_select datetime_select time_select collection_select calendar_date_select) +
	%w(collection_select select country_select time_zone_select) -
	%w(hidden_field label fields_for)


	helpers.each do |name|
		define_method(name) do |field, *args|
			options = args.last.is_a?(Hash) ? args.pop : {}
			args << options.except(:label, :sub_label)
			locals = { :element => super(field, *args), :label => label(field, options[:label]), :sub_label => options[:sub_label]}
			@template.capture do
				@template.render(:partial => 'forms/field', :locals => locals)
			end
		end
	end
	
end