Laravel image submit button

Laravel image submit button

I'd like to know if there is a way to customize the look of a submit
button (to be an Image instead) in Laravel 3.
Currently, my submit button code looks like this :
{{ Form::open('project/delete', 'DELETE') }}
{{ Form::hidden('id', $project->id) }}
{{ Form::submit('Delete project', array('class'=>'btn')); }}
{{ Form::close() }}
And it's doing his job correctly. But I don't see how I could customize
the submit button and put it as a bootstrap icon for example with ; <i
class="icon-trash"></i>
I tried using :
{{ HTML::decode(HTML::link_to_route('project_delete', '<i
class="icon-trash"></i>', array($project->id))); }}
But then I have a problem with my route/ function call.
Thank you.