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. Dry brush more lightly with Celestra Grey
4. Base the parchement in Ushabti Bone , the flesh in Rakarth Flesh , the maggots in Pallid Wych Flesh and the blue smoke in Thunderhawk Blue
5. Dry brush very lightly and highlight the details if you want with White Scar

Green power armour

1. Contrast 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

1. Contrast Ork Flesh

Slime

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

Gold

1. Base Balthasar Gold
2. Shade with Agrax Earthshade
3. Add rust spots of Typhus Corrosion and Nihilakh Oxide

Brass

1. Base Castellax Bronze
2. Shade Agrax Earthshade
3. Add rust with Nihilakh Oxide

Silver

1. Base Iron Hands Steel ( Iron Warriors ?)
2. Shade randomly with spots of Nuln Oil and Agrax Earthshade
3. Add rust spots with Typhus Corrosion

Visor

1. Base White Scar
2. Contrast Baal Red

Maggots

Already based in Pallid Wych Flesh

1. Shade Seraphim Sepia

Tongue / Tentacles

1. Contrast Volupus Pink
2. Shade Druchii Violet if needed

Abscess

1. Contrast Magos Purple
2. Shade Druchii Violet if needed

Nurglings / Creatures

1. Contrast Volupus Pink

Flesh

Already based in Rakarth Flesh

1. Shade with Reikland Fleshshade

Blue smoke

Already based in Thunderhawk Blue

1. Shade Drakenhof Nightshade
2. Shade Drakenhof Nightshade + White Scar + Contrast Medium at the tip

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

or

1. Base Incubi Darkness
2. Edge highlight with Kabalite Green

or

1. At the step 3 of the undercoat, base with Incubi Darkness
2. After the white drybrush (step 4), contrast with Talassar Blue

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
4. Eventually, add a little bit of Iyanden Yellow at the base of the coils to tint the white.

Mushroom

1. Contrast Striking Scorpion Green