I love the Spawn kits with all their wibbly options. I intend to add a trio of these degenerates to my Night Lords army. I got them all to a certain stage of prep, then rushed ahead and completed this guy.
After his black undercoat I hit him with Mephiston Red spray from one side. This did much of the complex blending for me, and I highlighted him up from there. I added a tiny bit of armour plating to each's shoulder. This allowed me to apply the distinctive Night Lords metallic blue which defines the collection. The red Blood For The Blood God really added a bit of 'pop' at the last stage as it vibrates against the blue.
You can take Spawn as part of the Chaos Cultist Necromunda gang (the rules for which were printed in White Dwarf a while back). So he's double the fun (which is totally an expression which needs to be used in conjunction with Spawn).
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