You're probably familiar with grass in New Vegas. That swaying stuff sticking up from the soil. Did you know that those aren't real placed objects in the world, they're meshes that are procedurally scattered onto specified landscape textures. The vanilla grass does a good job adding detail to the dirt and grass textures, but when it comes to rock and pebble textures, everything becomes quite barren. I created 3 pebble meshes and set them to appear on the RockCanyonRubble landscape texture (the most common one in the game.) Now the world is peppered with nice, delectable rocks and pebbles where it makes sense to see them, similar to modern Bethesda engine games like Skyrim and Fallout 4.

The appearance of the pebbles will vary greatly depending on your installed textures. In my screenshots, I'm using slightly edited landscape and rock textures, so my rockcanyonrubble is a bit lighter and browner, and so are my rocks. Less Green Clifftops (featured in Viva New Vegas) is an excellent choice in the meantime if you find the pebbles stick out too much colour-wise. NMC's should look fine. I can't speak to any other terrain textures however.

There is one issue!! The grass system is derived from the Speedtree system, seen prominently in Oblivion. That means grass can not be rotated. If there was only one pebble mesh, it would look like the same mesh repeated a million times, not even random rotation to mask it. There's three meshes so it's not an issue, rocks look fittingly random. The issue is that rocks won't rotate to fit slopes, so very occasionally with weird, messy, steep terrain a pebble or two might be floating a bit above ground. Not a very noticeable issue at all but it happens so I'll mention it. For me, it's more than worth it. This is New Vegas, I've seen a floating object or two before.