My version for the death guard patrol and kill team.
This is a work in progress and I haven't tried it yet. I write this to remember my intention and will update this recipe as I paint it.

Undercoat

1. Prime the model in Chaos Black
2. Dry brush heavily or use a sponge with Eshin Grey
3. Base the parchement in Ushabti Bone , the flesh and the maggots in Pallid Wych Flesh and the blue smoke in Thunderhawk Blue
4. Dry brush lightly and highlight the details if you want with White Scar

Green power armour

1. Use Dark Angels Green

Red cloth

1. Contrast Sigvald Burgundy

Bone / Teeth

1. Contrast Skeleton Horde
2. Shade the tip of the hornes with Agrax Earthshade

Parchment

Already based in Ushabti Bone

1. Trace fine lines with Abaddon Black
2. Shade lightly with Seraphim Sepia

Green hoses / Tentacles

1. Contrast Ork Flesh

Slime

1. Contrast Striking Scorpion Green
2. Add some light touch of Nurgles Rot

Gold

1. Base Retributor Armour or Balthasar Gold (TBD)
2. Shade with Agrax Earthshade
3. Add rust spots of Typhus Corrosion and Nihilakh Oxide

Brass

1. Base Runelord Brass
2. Shade Agrax Earthshade
3. Add rust with Nihilakh Oxide

Silver

1. Base Iron Hands Steel
2. Shade randomly with Nuln Oil and Agrax Earthshade
3. Add rust points with Typhus Corrosion

Visor

1. Base White Scar
2. Contrast Flesh Tearers Red

Maggots

Already based in Pallid Wych Flesh

1. Shade Seraphim Sepia

Tongue

1. Contrast Luxion Purple

Nurglings / Creatures

1. Contrast Volupus Pink

Flesh

Already based in Pallid Wych Flesh

1. Contrast Reikland Fleshshade

Blue smoke

Already based in Thunderhawk Blue

1. Shade Drakenhof Nightshade

Leather

1. Contrast Snakebite Leather

Gun (black parts)

1. Contrast Black Templar

Chaos sword

1. Contrast with a mix 5:1 Talassar Blue and Dark Angels Green

Red plasma

1. Base with Fire Dragon Bright
2. Highlight the base of the coils with White Scar mixed with Contrast Medium 1:1
3. Darken the top of the coils with Mephiston Red

Mushroom

1. Contrast Striking Scorpion Green or Tesseract Glow