Textures and texture tools

http://www.3d-rekonstruktionen.de/downloads/

You will find a tool called "Bricks'n'Tiles. It will create seamless brick textures, e.g. from photographs:

"With Bricks'n'Tiles you can create perfectly seamless brick textures in photorealistic quality in a couple of minutes.
Just select a few bricks from any source images such as photos taken with a digital camera. Bricks'n'Tiles automatically arranges the bricks and slightly alters the brick colors by random to create any possible brick pattern..."

The second tool called texture viewer will help you creating seamless textures easily:

"TextureViewer is a small program that makes it easy to preview texture files. Some features are:

Supports many common image formats
Displays texture tiling
Creates seamless textures
Basic image filters (Color, Effects)
Special texture filters"