Mill Creek Haunted Hollow
I have actually seen this technique done before. The moss you see is actually grass from model railroad kits. I watch a YouTube channel from someone called S.K Austin. He's great and I've learned a lot from him. He has a 2 part tutorial on tombstones and covers the moss technique you have in your picture I quoted. It's about 11 minutes into the video:
OMG! This is so totally, completely, over-the-top awesome!!!Below is an image from another method....the concept has some similarities to that of the application of the railroad flock, but I think might have some larger scale applications that could be of value.
The post for the tutorial from Raven's Hollow can be found here
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SPANISH MOSS: Dollar Tree sells decent sized bags of spanish moss for a buck. Look in the floral aisle.I love the "flocking" idea but what i have done with my tombstones is, i have gone to a craft supply store and gotten a large bag(s) of spanish moss and simply hot melt glued it to my tombstones. Once it anchored to the stone you can "drape" or "dangle" the moss off the stone to get an even more realistic look.