According to the current Codex: Necron on page 17.
Twisted and ghoulish terrors of the night, the Flayed Ones advance before the Necron force, spreading fear like a plague before them. Stooped yet terrifying agile beast's from man's darkest nightmares, the Flayed Ones long flensing blades can strip the skin from their prey in seconds. Thin and wiry, they adorn themselves woth the still wet hides of their victims, leaving the skinned corpses to sow fear and confused amongst their enemies ranks.
Why did i quote this passage, well Nicholas Hadrian stated that the current Flayed ones look like they are wrapped in "Toilet Paper". I would consider that it would be hard to sculpt any Flayed One model that has flayed skin on it and does not look like "Toilet Paper".
Ultramarines are Pussies
Except Dark Angels, any chapter that sounds like a Death Metal Band can't be that bad.