Can I use Unity provided example scene assets as an example of my shader package?

I'm almost finished implementing my shader package, but I need a somewhat detailed scene to make it look good. So my question is: Can I use the models/assets provided by unity in the example scenes(such as angrybots) and modify it as my example scene? I'm not trying to resell the assets, I just need a detailed scene as a showcase/example scene for my shader package(which I want to sell on unity store). I've been modeling for some time now, finished a few models but it's still not close to completing a detailed scene. And do you need unity pro in order to sell shader packages on unity store? Thank you.