I have never used old coffee grounds on my layout nor have I used fresh, unused coffee there either, after having done so on my toy soldier diorama displays. Let me explain why I would not advocate unused coffee. If it get any type of moisture--even from the air, the coffee will degrade and stain your surface and also smell like----well, coffee. I have used it with better results as just a bit of loose filler in conjunction with other landscaping materials and away from my toy soldier figures to avoid any staining. As long as there is sufficient air around the granules, I don't think you'll have too many problems. To concentrate the coffee granules invites some of the problems I have mentioned. Now, old, used coffee--I don't know because it can possibly turn moldy and perhaps invite bugs as well. You might be better off using inert materials. I have used sand after baking it in an oven to kill off any organisms that might be in it.
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