Here are some of the blocks I worked on lately.
I improved the netherite block, giving it a scruffed metallic appearance.
I also designed crimson nylium blocks (side & top), I used vein or tendril-like patterns on the ground to mimick some kind of hellish mycelium root.
Ancient debris (side & top) I designed as rocky concretions with metallic inserts and a scale-like POM pattern to roughly follow the overall style of the original block. Metallic inserts are there to represent the netherite ore that can be extracted from those blocks.