try google. mainly procedural textures are just calculated inside the shader.
like :

Out.color = float3(sin(position.x/10),cos(position.y/2),-cos(vecTime.w/41));

thats procedural. if you are looking for wood for example, look

http://www.earthcontrol.de/gallery/HLSL_experimente/wood_0.jpg

http://www.earthcontrol.de/gallery/HLSL_experimente/hlsl_8fx.txt

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