This mod retextures the ground of all regions, except for the rock textures. Now includes a normal and parallax patch for OpenMW

C:\games\OpenMWMods\Landscape\LandscapeRetexture\2K
C:\games\OpenMWMods\Landscape\LandscapeRetexture\Bloodmoon Landscape Retexture
C:\games\OpenMWMods\Landscape\LandscapeRetexture\Landscape retexture Normal map parallax

Download the 2K main file as well as the OpenMW Normal map and Parallax patch file. Rename the folder from the normal map/paralax file from Landscape retexture Normal map & parallax to Landscape retexture Normal map parallax; OpenMW will chop off the & in the cfg file if you don't, causing them to not be used.

If you aren't using Solstheim Tomb of the Snow Prince, download the Bloodmoon Landscape Retexture file also.

Note that Tyddy's Landscape Retexture is listed as an alternative to this, but it can compliment this one (providing many textures this does not).