adobe photoshop - How to create a speckled/pixelated background?

How would I replicate this speckled/pixelated background effect?

You might need to zoom in to see the effect fully.

Answer

This is pretty simple.

Create your background layer and fill it with the color that you want. Then choose Filters>Noise>Add Noise... from the menus. Make sure Monochromatic is checked, and adjust the Amount until it looks how you want.

Hope this helps!