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Hi!

The easiest way (well..) to achieve this effect is with the gist you asked about in your other post: set the posts/pages up in their set places and let WP Tiles automatically come up with that last tile, that contains the most recent post.

Alternatively, you could add a function to wp-tiles-data, that adds another tile to the tile array. Something like:

<?php
add_filter( 'wp-tiles-data',function( $data ) {
    $posts = get_posts( array(
        'numberposts' => 1
        // Posts query goes here
    ) );

    $post = reset( $posts );

    $hideByline = apply_filters( 'wp-tiles-hide-byline', $hideByline, $post->ID, $post );

    $categories = wp_get_post_categories( $post->ID, array( "fields" => "all" ) );

    $category_slugs = $category_names = array();
    foreach( $categories as $category ) {
        $category_slugs[] = $category->slug;
        $category_names[] = $category->name;
    }
    $data[] = array(
        "id"          => $post->ID,
        "title"       => apply_filters( 'the_title', $post->post_title ),
        "url"         => get_permalink( $post->ID ),
        "byline"      => $byline,
        "img"         => wp_tiles()->get_first_image( $post ),
        "color"       => $color,
        "bylineColor" => 'rgba(0,0,0,0.7)', // Your colour goes here
        "hideByline"  => false, // or true..
        "categories"  => $category_slugs
    );
    return $data;

} );

Mind you: untested code!!

Good luck!
Mike