Hi Scorpion

To go fats and easy a cheap tool exist and is really great :
texture maker

Even a basic version do it and lot lore more like texture generation by combining filters, masks , generators etc ...
Easy to do wood, stome textures with it : just try it !


OR you can use 3D Coat , but its costs lot more caus it's a scultping tool mainly, but it hat has seamless texture painting on diffuse, specular and normal canels all seamless !




For your case and a cheap tool , i think texture maker is the tool