Procedural Texture Creator - MapZone

http://www.mapzoneeditor.com/

Creates seemless procedural textures that are great for tiling on walls and floors, as well has being high detail and small (mostly).

This is great, but I think we prefer to create our own textures. Photoshop has an offset tool which is used to create tiled textures as well as a Black and White mode in CS3 to made interesting bump maps from original textures.