Angularjs 1.3 shows off some material design demos: https://material.angularjs.org
In fact, this is like a mini-ionic and they have some features that I believe ionic could benefit from:
Subheaders, as shown here: https://material.angularjs.org/#/demo/material.components.subheader
I’m pretty surprised by the performance of this on mobile, works really well
Scroll shrink at the bottom of this page: https://material.angularjs.org/#/demo/material.components.toolbar
The way their tabs work: https://material.angularjs.org/#/demo/material.components.tabs
The way they handle a large amount of tabs and the ability to swipe between tabs.
Might be an easy win to integrate this into ionic?