But that's not how the pattern would look, right? In previous example you shown that the pattern would produce gaps when tiles are rotated, hence my question about its usefulness. On the other hand, why would you want use the pattern for things like grass when the scatter is clearly superior at such tasks?
This is how it will look like in this case, i made a small grass sample for the pattern by scattering small samples of grass inside a rectangular shape (you can see it on the right) and applied it via geopattern in V-ray. If you scatter not just boxes, then the gaps do not seem to be noticeable during rotation.
There are quite a lot of applications like this, i would use it for example on complex surfaces to create fine moss on rocks, for gravel, mulch, stabilized grass for say visualization of dioramas, these are just what came to my mind right now. Controlling the distribution by changing the UV coordinates is generally quite convenient, all I need right now is overlapping.
PS and I also just thought that it would be pretty handy if CoronaPatternMod wil take into account the CoronaDisplacementMod lying under it and applied the patterns to the already deformed mesh, anyway, because both of these effects are render-time only