I'm not sure if this qualifies, but I really love the DC Comics site.
Throughout my studies in EdTech, I've become intrigued by using comics in the classroom due to how interactive they are and due to the fact that they ask readers to use visual as well as verbal communication skills.
The DC site takes this one step further by adding videos, which bring in the sound element. It also has a place that highlights fan art. UDL embraces the idea that expression doesn't just come in written form. Drawing and making art are also ways that people make sense of the world.
For me as a visual artist, I have found that when I incorporate visuals, I get a bigger response. They send a message that words alone can't. And they speak to people sometimes on a visceral level.
I would definitely use a similar strategy in my posts. I'm already using it in some of the books that I'm publishing. I really love design!