In this tutorial I am going to show you how to create a noise background. Probably you noticed that I use the a lot in my designs. First create a new image by going to File » New and fill the height and width field with the value 100. After that fill it with a color.
Then go to Filter » Noise » Add Noise. Now, I usually check monochromatic and I add only a little bit of noise, around 3-4% for my backgrounds. You can do it as you desire.
This is my result: