These miniatures are very detailed, so you can paint them in several ways.
First, let me introduce boys I moved to 40K universe - Miles' jazz band Chaos noise marines of Slanesh.
I painted them in their characteristic "Blue in Green" colors, using standard technique - black undercoat and then blue, green, rotten flash and metal layers.
Here are some more miniatures, the ones I am still to use in the combat. They are all temporary based on 2cm washers.
First some feather-brains chieftains, painted by layering. With little patience you can paint every feather on them in different color, but for 6mm it would be too much.
And finally some bugs, painted by mixing two methods mentioned above: