This is the result of one of my earlier procedural texture trials. Created with 3DS Max and Zbrush. It has: 

Diffuse Map
Height Map (Perfect)
Normal Map (Shape and detail, both perfect) 
Ambient Occlusion Map (Perfect)
Specular Map (Kinda low quality)

Detailed normal map is seperate so that it can be mixed however you like. All maps are 4096x4096, perfectly tiling. Original renders were 8192x8192, downscaled to prevent aliasing.

Preview pictures are 512x512 PNGs, no need to download bigger ones if that size is enough for you.

Files are in 4096x4096 TGA format. Compressed with 7zip.