This video tutorial goes through the steps to creating a seamless texture from a photograph in Photoshop. The seamless texture you get from this process could be used for the texturing and visualising of 3d models. The key steps in this process can be seen below:
0:22 - Testing the image repetition using the 'Offset' Filter
1:06 - Removing the seams using the 'Clone Stamp' tool
3:58 - Reducing repetition within the seamless texture
5:05 - Testing this seamless texture on a 3d object