Sculk, of course. I like how it looks in Complimentary shaders, it looks like jello and the textures dont change how it looks, so that means you can install a trypophobia sculk pack and enjoy feeding hollowed some cinnamon rolls. Recommended packs are:

Trypophobia Sculk/The Hollow

Med's Fixed Hollow Sculk (Highly recommended because of how nice it looks.)

hallowed hunchback warden v1.5 sculk (rip)