The decoupler/separator/hazardstripes textures are made by SwGustav: http://forum.kerbalspaceprogram.com/threads/106130?p=1750942&viewfull=1#post1750942

The other textures in this folder are mods by Yemo of the original textures
from ProceduralParts by Ancient Gammoner, NathanKell, e-dog, Swamp Ig, OtherBarry, Tiberion,
Chestburster, Dante80 and jsimmonds.

Procedural Parts forum thread:
 http://forum.kerbalspaceprogram.com/threads/70676

The non-decoupler textures are distributed under the original mods license CC-BY-SA 3.0.