In 2014 I went on a few hikes and took a cheap digital camera with me. I mainly took pictures of the ground, such as dirt and rocks. Later I edited them to be seamless/tileable, made normal maps and attempted heightmaps as well. The majority of the textures are 2048×2048, although a few are smaller. There are 36 diffuse textures, with 88 texture files in total (counting diffuse, normals, and heightmap.)
Here is a jpg sample (downloads come as png) of a diffuse and normal texture from the pack (click on the image to see at 2048×2048):
If you like these free ground textures then please take a moment and vote yes or no on the Daath Origins Steam Greenlight campaign.