A selection of potential Ork skin tones that I want to try. I will update with images as I try them personally. These were mostly pulled straight from 'eavy-archive.com', but If I change or tweak anything, I will amend these recipes.

Ghazghkull Skin

1. Basecoat: Elysian Green/Waaagh! Flesh 2:1
   Shade: Waaagh! Flesh
   Deep Shade: Caliban Green/Rhinox Hide 2:1
   Highlight: Elysian Green
   Highlight: Skarsnik Green/Averland Sunset 4:1
   Highlight: Krieg Khaki
   Highlight: Krieg Khaki/Corax White 1:1

Beast Snaggas

1. Basecoat with a 1:1 mix of Skarsnik Green and Averland Sunset .
2. Add a little Warp Lightning to the base mix and add some general shading to the recesses.
3. Shade deep recesses with small amounts of thin Caliban Green .
4. With an equal parts mix of Skarsnik Green , Averland Sunset and Zandri Dust , begin highlighting the skin.
5. Mix in some Screaming Skull to the above mix and selectively highlight points.
6. Finally add very small highlights of pure Screaming Skull to prominent points,
7. Glaze Kislev Flesh over knuckles, ears, elbows and lips. The re-add specular highlights of Screaming Skull , if needed.
8. Add warmth to lips and raw looking areas with another glaze of Carroburg Crimson .

40K Orks

1. Basecoat: Averland sunset + Skarsnik green.
   Shade: Biel-tan green.
   Deep Shade: Coelia greenshade.
   Layer: Ogryn camo.
   Highlight: Krieg Khaki
   Around lips, ears, etc, Glaze Kislev Flesh, Khorne Red + Kantor Blue, Doombull Brown.
   Highlight: Screaming skull/White

Ironjaws

1. Basecoat with Elysian Green .
2. Build up layers with Elysian Green and Ogryn Camo , mixed 1:1. Covering a smaller area.
3. Repeat the above step, covering even less area with pure Ogryn Camo .
4. Make a mix of 3 parts Athonian Camoshade , 1 part Drakenhof Nightshade and 1 part Biel-Tan Green . Use this mix to glaze over the skin, pulling pigment towards the recesses.
5. Add a small amount of Incubi Darkness to the above mix and shade only the deepest recesses.
6. With a 1:3 mix of Ogryn Camo and Screaming Skull , selectively highlight the skin.
7. Add very small/specular highlights with Screaming Skull .
8. Glaze Kislev Flesh over knuckles, ears, elbows and lips. The re-add specular highlights of Screaming Skull , if needed.

Kruleboyz 1

1. Basecoat skin with Ogryn Camo and Elysian Green , mixed 1:1.
2. General recess shade with thin Deathworld Forest .
3. Deep recess shade using thin Vulkan Green .
4. With an equal parts mix of Ogryn Camo , Krieg Khaki and Ushabti Bone , selectively highlight the skin again.
5. Now increase the amount of Ushabti Bone in the mix, so it is roughly 50% and selectively highlight the skin again.

Kruleboyz 2

1. Basecoat skin with Ogryn Camo .
2. General recess shade with a 1:1 thin mix of Deathworld Forest and Loren Forest .
3. Deep recess shade using a thin 1:1 mix of Caliban Green and Mournfang Brown .
4. With 2 parts Ogryn Camo and 1 part Krieg Khaki , edge highlight the skin.
5. Now with 1 part Ogryn Camo and 2 parts Krieg Khaki , selectively highlight the skin again.

Kruleboyz 3

1. Basecoat skin with a 1:1 mix of Ogryn Camo and Krieg Khaki .
2. General recess shade with a 1:1 thin mix of Death Korps Drab and Nurgling Green .
3. Deep recess shade using thin Death Korps Drab .
4. With 2 parts Ogryn Camo and 1 part Krieg Khaki , edge highlight the skin.
5. With an equal parts mix of Ogryn Camo , Krieg Khaki and Ionrach Skin , add highlights to the flesh.
6. Now increase the amount of Ionrach Skin in the mix, so it is roughly 50% and selectively highlight the skin again.

Kruleboyz 4

1. Basecoat skin with Nurgling Green .
2. General recess shade with a 1:1 thin mix of Ogryn Camo and Sons of Horus Green .
3. Deep recess shade using thin Dark Reaper and Loren Forest , mixed 1:1.
4. Mix a little Wraithbone and Grey Seer , then take the same mount of Nurgling Green green, so it is 50% of the mix. Use this mix to add highlights to the flesh.
5. Now increase the amount of Wraithbone and :Citadel/GreySeer in the mix, so all paints have roughly the same amount. Then selectively highlight the skin again.

All of these Kruleboyz recipes can be finished off by blending Ushabti Bone into ears, knuckles, knees, elbows etc. Then adding thin glazes of Khorne Red and/or Carroburg Crimson / The Fang mixed 2:1.

For the lips, glaze with Vulkan Green and add Deepkin Flesh to highlight.