I did a few things for the Daydream system UI. There were lots of explorations on things like app launching and settings. Here, the icons transition from 2D to 3D on hover:

These menus scroll beneath the surface of the portal and hover closer to the surface. You can see how it progressed over time:

I used After Effects to try out this design, then built it in Unity:

Here you can see what some of the specs looked like:

I also spec'ed support for Android 2D apps. The idea for the cursor was to morph depending on its moving/resizing functionality:

The edges show which direction you are resizing and corners are an affordance for the minimum size:

Daydream's 6dof headset needed a stationary safety system that was not roomscale, and had to be a relatively small radius around the user. I suggested we use vignetting based on a sphere to suggest the directionality.

I used the assets from a Unity tutorial to make a VR game to collect data on how far people moved while dodging with a UI to try different radii and colors.

Of course, there was a bunch of other cool explorations and stuff I wish I could post, this was just as far as the shipping product got.