In this tutorial you can design images for your sites.
Follow the following steps:
1. Select an image to edit and open in photoshop. Take this image of bird as an example.
2. Go to View-Rulers so that you can calculate the length and breadth to be cut.
3. Select Rectangular Marquee Tool and make a selection in the image to be cut.
4. While selected press Ctrl+X to cut and Ctrl V to paste. The cut portion is pasted into new layer.
Continue doing this selecting by Marquee tool, cutting and pasting. Here I have made 9 pieces therefore finally you get 10 layers altogether(9 pieces+1 background).It looks like this.

5. Now select layer 1 and go to Blending Options as shown below.
6. In layer style select stroke. Select color white, size10, position inside as shown below.(you can apply according to your need)

7. Now rotate it as it suits.
8. You have completed 1 layer. Do the same for the remaining other layers and you are done.
Final copy looks like this. Enjoy.