If anyone is interested, I have figured out a way to do what I wanted (see above post).
Now, when a user clicks on an image in the bundle, a pop up of that image appears instead of going to that product's info page.
You can view here:
JustPillows.com Collections
Here are the code changes:
In product_info_tpl.php (the one from the bundle contrib), find:
echo "<tr><td class=main valign=top>";
echo '<a href="' . tep_href_link(FILENAME_PRODUCT_INFO, ($cPath ? 'cPath=' . $cPath . '&' : '') . 'products_id=' . $bundle_data['products_id']) . '" target="blank">' . tep_image(DIR_WS_IMAGES . $bundle_data['products_image'], $bundle_data['products_name'], SMALL_IMAGE_WIDTH, SMALL_IMAGE_HEIGHT, 'hspace="1" vspace="1"') . '</a>';
And replace with:
echo "<tr><td class=main valign=top>"; ?>
<script language="javascript"><!--
document.write('<?php echo '<a href="javascript:popupWindow(\\\'' . tep_href_link(FILENAME_POPUP_IMAGE, 'pID=' . $bundle_data['products_id'] . 'ℑ=0') . '\\\')">' . tep_image(DIR_WS_IMAGES . $bundle_data['products_image'], addslashes($bundle_data['products_name']), SMALL_IMAGE_WIDTH, SMALL_IMAGE_HEIGHT, 'hspace="1" vspace="1"') . '</a>'; ?>');
//--></script>
<?php
Hope that helps someone.
Thanks again for the absolutely AWESOME contrib!