I think the new Sculk themed blocks and mobs would be neat. Im pretty sure a lot of people would like some kinda corruption-wise Skin. I think theres a lot of skins that basically mix Zombie and regular skin already since thats fairly basic, but things like Axolotls, Wardens, Iron golems etc. havent really been implemented yet. Id start with sculk blocks tho since they look kinda cool, are new and might be interesting.