A knight in armor

An underwater shipwreck: a wooden galleon on its side on the ocean floor, holes in the hull, coral and seaweed growing on it, treasure chests spilling gold, and fish swimming around

A massive world tree: an enormous trunk with roots visible above ground forming archways, multiple levels of thick branches like platforms, glowing fruit hanging from smaller branches, and vines draping down

A phoenix rising from flames: wings fully spread upward, tail feathers flowing down like fire, head raised to the sky, made of red, orange, and gold blocks with glowstone accents

A floating island ecosystem: a chunk of earth suspended in air with waterfalls pouring off multiple edges, a small forest on top, exposed roots and rocks hanging underneath, and smaller floating rocks nearby connected by ancient chain bridges

A medieval stone castle with curtain walls forming a square, four tall corner towers with battlements, a central keep, a gatehouse with an archway and portcullis, and a surrounding moat with a small drawbridge.