Enriching accessories recommendations?

What out of the box things have you done/created/bought to make your beardie’s enclosure more enriching and entertaining? I feel like we all struggle with always feeling like we could do more with their tanks. My girl is in a 4x2x2 but with such a large space it feels empty and just boring. Help me out! I bet we could all benefit from each other’s ideas and input. I’m thinking of building a multi-level climbing structure out of cardboard.