This is my take on the colour scheme of the Dark Wolves, featured in the Chaos Space Marines codex from 4th Ed. 40k.

The main colours are dark grey, light blue, red and silver.

General Information:

My general method is to lay down all the base colours for the model, then do all the shading in the recesses before moving on to the highlights.

I don't own an airbrush, so the recipe will mainly consist of brush on paints.

Priming:

1. Prime the model with Mechanicus Standard Grey

Dark Grey (Armour Panels - Lower Legs, Chest, Arms, Shoulder Pads, Head, Middle of Backpack):

1. Base with Eshin Grey
2. Shade the recesses with Nuln Oil
3. Highlight sharp points and fine edges with Dawnstone
4. Add point highlights with Administratum Grey

Light Blue (Armour Panels - Upper Legs, Backpack Vents ; Armour Trim - Shoulder Pads):

1. Base with Thunderhawk Blue
2. Shade the recesses with Nuln Oil
3. Highlight fine points and sharp edges with Fenrisian Grey

Red (Details - Chaos Icons, Right Knee Guard, Lenses):

1. Base with Mephiston Red
2. Shade the recesses with Agrax Earthshade
3. Highlight the edges with Wild Rider Red
4. Highlight fine points with Fire Dragon Bright

Silver (Details - Backpack Arms, Chainmail, Weapons):

For grenades, replace Nuln Oil with Athonian Camoshade

1. Base with Leadbelcher
2. Shade the recesses with Nuln Oil
3. Highlight fine points and sharp edges with Stormhost Silver
4. Add a rust effect with thinned Skrag Brown

Black (Details - Cloth, Wraps, Gun Casing, Armour Ribbing):

1. Base with Abaddon Black
2. Highlight the edges with Eshin Grey
3. Add fine points

Brown (Details - Leather Pouch):

1. Base with Rhinox Hide
2. Shade the recesses with Agrax Earthshade
3. Roughly highlight the edges with Skrag Brown
4. Add a fine highlight with Ushabti Bone

Tan (Details - Horns, Teeth):

1. Base with Rakarth Flesh
2. Layer the lower half with Skrag Brown
3. Shade over with Agrax Earthshade
4. Add lines of Rakarth Flesh to the upper portion
5. Add points of Pallid Wych Flesh

Gold (Details - Shoulder Icon, Melta Barrel):

1. Base with Retributor Armour
2. Shade the recesses with Agrax Earthshade
3. Highlight fine points and sharp edges with Stormhost Silver

For a burned in look on the meltagun barrel add a layer of Druchii Violet extending two-thirds up from the muzzle, followed by an additional layer of Drakenhof Nightshade just around the muzzle.