Texture is a major element of all art. But there is a special significance with both digital art and photography, where detail is established and maintained through such means. That is why it is no surprise that Flickr, a place dedicated to those two mediums, is full of groups dedicated to textures.

Here are just a few of the textures at the TexturesForAll group:






 

... and here's the entire post from Inspiredm.com with all 10 Flickr texture photo groups:

http://www.inspiredm.com/10-best-flickr-groups-for-texture-inspiration/