I ported half of React based Material UI ( http://material-ui.com/ ) to Ember components. It shares the same CSS.
There are some neat things in there. Have a look. I’ll try to put up a demo page soon.
I plan to add the remaining components they have when I have some time. Right now there are buttons, paper, text inputs, checkboxes, radio buttons, icons, dropdowns, menus and selects.