These look a little silly, but they're very eye-catching and quite tzeenchy! Easiest with an airbrush, but if you don't have one, just reverse it, starting from the lightest colour and gradually glazing the others over in sequence.

1. Basecoat the cloak Violet 5 or Naggaroth Night
2. Spray the lower two thirds Magenta or Screamer Pink
3. Spray the bottom third Brown Rose or Bugman's Glow
4. Spray just the tips with Ivory or Wraithbone
5. Paint the folds with a 1:1 mix of Druchii Violet and water, and the deepest shadow with Payne's Grey ink, or any blue-black colour watered down.
6. Edge highlight the tears or gaps with Ivory or Wraithbone