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This is how i'm generating the product collection:

This is how i'm generating the product collection in the widgets block:

The widget's template page is a standard practice way to display price, reviews, pictures, etc in a pagesize varient format.

<reference name="content">
        <!-- Layered Navigation Block -->
        <block type="catalog/layer_view" name="catalog.leftnav" before="-" template="catalog/layer/view.phtml" >
                <block type="cms/block" name="cms_badges">
                        <action method="setBlockId"><block_id>cms_mustang_badges</block_id></action>
                </block>
        </block>
</reference>

<reference name="content">
        <!-- Layered Navigation Block -->
        <block type="catalog/layer_view" name="catalog.leftnav" before="-" template="catalog/layer/view.phtml" >
        </block>
</reference>

Below is the code i'm using to display both the products and layered navigation on CMS pages. However, the layered navigation filter isn't being populated by attributes to allow for filtering.

<reference name="content">
        <!-- Layered Navigation Block -->
        <block type="catalog/layer_view" name="catalog.leftnav" template="catalog/layer/view.phtml" >
                <action method="setCategoryId"><category_id>2250</category_id></action>
        </block>
</reference>

<reference name="content">
        <block type="catalog/product_list" name="home" template="catalog/product/list.phtml">
                <!-- Product List View -->
                <action method="setCategoryId"><category_id>2250</category_id></action>
                <block type="catalog/product_list_toolbar" name="product_list_toolbar" template="catalog/product/list/toolbar.phtml">
                        <block type="page/html_pager" name="product_list_toolbar_pager"/>
                </block>
                <action method="setToolbarBlockName"><name>product_list_toolbar</name></action>
        </block>
</reference> 

category, with id equal to '2250', has it's anchor attribute set to 'yes'.

I'm attempting to add layered navigation to a CMS page containing a widget that contains a custom product collection (products that are 'new'). Within this widget are fuctions that, given the correct parameters, will filter this collection. How do I pass this collection to the layered navigation block and have it's attributes show up?

This is how I am calling the layered navigation in the CMS custom layout XML:

<reference name="content">
        <!-- Layered Navigation Block -->
        <block type="catalog/layer_view" name="catalog.leftnav" before="-" template="catalog/layer/view.phtml" >
                <block type="cms/block" name="cms_badges">
                        <action method="setBlockId"><block_id>cms_mustang_badges</block_id></action>
                </block>
        </block>
</reference>

This is how i'm calling the product collection onto the CMS page:

{{widget type="catalog/product_widget_new" display_type="new_products" show_pager="1" products_count="60" template="catalog/product/widget/new/content/new_grid.phtml"}}

This is how i'm generating the product collection:

protected function _getProductCollection()
{
    $todayStartOfDayDate = Mage::app()->getLocale()->date()
        ->setTime('00:00:00')
        ->toString(Varien_Date::DATETIME_INTERNAL_FORMAT);
    $todayEndOfDayDate = Mage::app()->getLocale()->date()
        ->setTime('23:59:59')
        ->toString(Varien_Date::DATETIME_INTERNAL_FORMAT);
    /** @var $collection Mage_Catalog_Model_Resource_Product_Collection */
    $collection = Mage::getModel('catalog/product')->getCollection()->addAttributeToSelect('*')->setVisibility(Mage::getSingleton('catalog/product_visibility')->getVisibleInCatalogIds());
    $this->_addProductAttributesAndPrices($collection)
        ->addStoreFilter()
        ->addAttributeToFilter('news_from_date', array('or' => array(
            0 => array('date' => true, 'to' => $todayEndOfDayDate),
            1 => array('is' => new Zend_Db_Expr('null')))
        ), 'left')
        ->addAttributeToFilter('news_to_date', array('or' => array(
            0 => array('date' => true, 'from' => $todayStartOfDayDate),
            1 => array('is' => new Zend_Db_Expr('null')))
        ), 'left')
        ->addAttributeToFilter(
            array(
                array('attribute' => 'news_from_date', 'is' => new Zend_Db_Expr('not null')),
                array('attribute' => 'news_to_date', 'is' => new Zend_Db_Expr('not null'))
            )
        )
        ->setPageSize($this->getProductsCount())
        ->setCurPage(1);
    return $collection;
}