1. Create new file with 72 PPI and white background.
Select Rectangular Marquee Tool and draw rectangle to create brick.
2. Fill it with the color.
If you want to fill foreground color press Alt + Del.
3. Choose Airbrush Tool with soft brush.
Select slightly darker shade than the filled color.
4. Press Shift and click top right, top left and bottom left to make the brick bevel like.
5. Keep the shape selected. Select Move Tool.
Press Alt and copy the shape. Place the shape as shown below.
6. Select the part of the image with Rectangular Marquee Tool in such a way that if it is repeated as a pattern you should get continuous design.
7. Edit > Define Pattern
8. Name the pattern and deselect with Ctrl +D
9. Edit > Fill > Pattern
Choose the pattern from the drop down menu
Choose the newly created custom pattern. Click OK.
The image will get filled with pattern.
