Firefox Cloud UX:

More info: Firefox.com reUX.

GitHub Enterprise UX:

More info: GitHub Enterprise reUX.

Amazon Prime Video UX:

More info: Prime Video reUX.

LinkedIn News UI:

More info: Improving LinkedIn's UX / UI.

Apple.com Redesigned in React:

More info: Apple.com React Redesign.

Mattermost Chat UI:

More info: Mattermost Chat UI Update.

Game & Site (Tiled Textures):

Themable OpenGL & WebGL:

Immediate mode UI, 9-patch and kerned Angel Code bitmap font support (vector fonts also). Button rethemes itself on mouse down (supports key binding/key-combos).

Java AWT Overrided (Tiled Textures):

A simple test game or interactive mockup I made on overriding the AWT's paint method to retheme components. Here it is much easier to see the limitations because none of the AWT colors are present so the limits can be tested.