Some more or less formal aspects of theme (skin) visual design.
Palette and color modes
Overview of light, dark, mixed and alternative palettes of HMIs.
Pros and cons of several visual styles, including flat and skeuomorphic user interfaces.
Foreground and background layers
Layer approach to organization of HMIs “surface”.
Base font styles
Standard hierarchy of font styles for basic, primary and secondary information display.
Overview of modular approaches to UI organization.