For some unknown reason I always wanted to create this kind of concrete walkway with the bumps in it, so finally I did. Rendered in Marmoset Toolbag 3.
This is a UE4 material function that can be used to add tessellation to any material. The height of the tessellation can be controlled with a scalar. The function has parameters inside that can be controlled in a material instance. The maxTessFactor is 15 by default IN ENGINE because it gets slower if you go higher on AMD cards. You can change the maxTessFactor by editing the FlatTessellation.ush and PNTriangles.ush files and then recompiling EVERY engine shader. The height is multplied by the tessellation factor, so the less you tessellate, the heightmap gets applied less. This also works with landscapes if you use Worldposition-XY coords instead of LandscapeLayerCoords. Copyable Blueprint