To give you an idea of the Material Design Theme that I created, you can take a look at this Example from my other lib. Also, like I said earlier, it’s totally stylable, I have added over 800+ SASS variables over time, so you can change it quite a lot. I have been working on the lib for over 3 years, it’s also fully tested.
If you want to get started with Aurelia-Slickgrid, then follow the Wiki - Step by Step or even easier than that, simply clone the Aurelia-Slickgrid-Demos.
Good luck.
Side Note, I have started working on the next major version 3.x, it shouldn’t be too much hard to switch from current version to the future. More info in this WIP PR, I’m expecting a release before year end and is totally unrelated to Aurelia2.