UE4 Stone & Sand Test

So I decided to boot up UE4 again, and fiddle around... since I want to create a wasteland "Mad Max" like scene in the near future, but wanted to figure out how on earth I can get the Sand to mix into crevices of rocks and such.
Here is a early result, still need to fiddle more with it, and well work more with Substance Designer to create a higher res, but so far so good :)