Hello Usnia,
Utilizing the foliage tool. You can also paint on static meshes with it. So, you can add some clutter as a brush inside of the foliage tool and then paint on a floor or whatever you choose to paint on that is a static mesh.
I will link you the documentation on the foliage tool that will help guide you through it’s uses and it’s functionality.
If you still have questions feel free to post here again and I will look into what you are trying to do.
Thank you,