1. Start with a 300x300 image, black background and white as foreground colour.
2. Create a new layer on top of the existing background layer.
3. Get your Paintbrush Tool ready with a 1px brush, and draw a shape similar to mine. Sort of a quarter circle, with the cracks branching out from it.
4. Now Duplicate this layer.
5. Go to Edit > Transform > Rotate and hold down shift and rotate the layer to match something like mine.
6. Select your top layer (should be Layer 1 Copy) and press Ctrl + e to merge down. Now you have 2 layers. Background and Layer 1.
7. Duplicate Layer 1, and once again Edit > Transform > Rotate, and complete the circle.
8. Select Layer 1 copy, and press Ctrl + e to merge down again. Duplicate this layer, rotate it again to fill in the gaps now. This time put it a bit off center also.
9. Continue this process, but also try to vary it up. Try using Edit > Transform > Flip Vertically and then Edit > Transform > Rotate to mix it up. The more time you put into this, the better your final product will look. Keep going until you have something similar to mine.
10. For a more realistic look, select the 1px Paintbrush tool, and draw some more lines more towards the center. Notice the difference in mine?
11. Once again, this step is not neccessary but it will help to enhance your final image. Select the Lasso tool (press L) and draw around some of the cracks that look reflected or repeated. This will help with a more random appearence. You can even draw some of your lines in with the Paintbrush tool!
12. Use Filter > Blur > Gaussian Blur with a radius of 0.3px.
13. Now press Ctrl + T and resize your image to make it smaller. Looks nice eh?
14. If you want to place your cracked glass, on a lighter background like mine above, just merge down all your layers together into Layer 1, set the Blending Mode for Layer to Difference, and change the colour of your background layer to the lighter colour.
