TS4 Skininator by CmarNYC at Mod The Sims

Tool Overview:

Create/Edit Custom Skin Colors
Cloning Tool : Clones game skintones and creates a package with the TONE files.
Clone Package Editor : Open and modify cloned packages.
TONE Manager : Add/Delete TONEs, modify flags defining the type and usage, modify the swatch color and various other settings, import and export the skin color images.
Overlay Manager : Add/Delete overlays, define which ages/genders each overlay applies to, import and export overlay images.
Previewer : Preview skintones.

Create/Edit Default Replacement Skin Details
Make New Default Replacement Package : Select which skin details you want to replace and clone them to a new package.
Edit/Test Default Replacement Package : Import/Export textures and preview the skin details.