Visual Studio 2017 themes
Source code - Visual Studio 2017 Themes
Predefined & Backdrop
Source code - Predefined & Backdrop
Dark-Blue themes
Dark-Blue themes
Dark themes with fadein & fadeout (Dark-Blue)
Dark-Blue themes with fadein & fadeout & ShowOnHover
Context Menu
right click to popup context menu
Source code - Context Menu
To create a custom theme, you should pick up a theme then edit it. Menu provides many state class as "FIRST" "ACTIVE" "OUT".