Creating a Halftone Background

Here a simple way to create a background texture with halftones:

1. Create a new file in Photoshop. I created a 600px x 600px at 72 dpi file for this example.
2. Fill the background with 50% gray.
3. Choose Filter > Pixelate > Color Halftone. I left the default angles alone and chose 8 px for one sample and 30 px for the other.

4. Choose Image > Adjustments > Gradient Map and pick whatever colors you like.
5. If the background you've created has too much contrast, you can apply levels or change the layer opacity to get the desired result.