Add new page layout option Magento

To meet your requirements you need to create an extension - without this it's not possible.

Module config file :

Create the module file config file at app/etc/modules/Amit_NewLayout.xml

Code:

<?xml version="1.0"?>
<config>
    <modules>
        <Amit_NewLayout>
            <active>true</active>
            <codePool>local</codePool>
            <depends>
                <Mage_Page />
            </depends>
        </Amit_NewLayout>
    </modules>
</config>

Define config.xml

Now define 1-column-version2.phtml as the template for the new layout in app/code/local/Amit/NewLayout/etc/config.xml

Code:

<?xml version="1.0"?> 
<config>
    <modules>
        <Amit_NewLayout>
            <version>0.0.1</version>
        </Amit_NewLayout>
    </modules>
    <global>
        <page>
            <layouts> 
                <new_cms_layout module="page" translate="label">
                    <label>New Cms Layout</label>
                    <template>page/1-column-version2.phtml</template>
                    <layout_handle>lookbook</layout_handle>
                </new_cms_layout> 
            </layouts>
        </page>
    </global>
</config>

Now, you will be able to see this layout in the CMS page layout options.