Custom [gallery] shortcode markup

I’m currently in the process of outfitting nivo-slider to work with gallery images from posts. I’m using the below code in conjunction with the Cleaner Gallery WordPress plugin.

<?php
echo do_shortcode('[gallery]');
?>

The issue I’m running into is that the gallery shortcode is adding all of this markup that I do not want. What I would like to know is if it is possible to strip the html markup that is associated with the following classes from being parsed.

.gallery {}
.gallery .gallery-row {}
.gallery .gallery-item {}
.gallery .gallery-item img, .gallery .gallery-item img.thumbnail {}
.gallery-caption {}

All that I want to be injected into the markup are a simple, non-listed set of images from the gallery like so:

<img src="foo" alt="bar" width="0" height="0" />
<img src="foo" alt="bar" width="0" height="0" />
<img src="foo" alt="bar" width="0" height="0" />

Any help would be greatly appreciated, thanks.