ORIENT/modules/cms/controllers/themes/_theme_list.htm

<?php
    $themes = Cms\Classes\Theme::all();
?>
<?php foreach ($themes as $index => $theme): ?>

    <div id="themeListItem-<?= $theme->getId() ?>" class="layout-row min-size <?= $theme->isActiveTheme() ? 'active' : null ?>">
        <?= $this->makePartial('theme_list_item', ['theme' => $theme]) ?>
    </div>

<?php endforeach ?>

<div class="layout-row links">
    <div class="layout-cell theme-thumbnail">
        <!-- Spacer -->
    </div>
    <div class="layout-cell theme-description">
        <a
            class="find-more-themes"
            href="http://octobercms.com/themes"
            target="_blank">
            <?= e(trans('cms::lang.theme.find_more_themes')) ?>
        </a>
    </div>
</div>