Use this tip to make grainy backgrounds in Photoshop✨
📎Select the area and apply the black&white gradient.
📎Duplicate this area and make your rectangles different for a more interesting result.
📎Convert everything into a smart object.
📎Apply liquify and use field blur. add a few points with different blur levels.
📎Now add noise and a gradient map.
📎Add some dark and light areas with a brush on the new layer.
📎Add some details if you want, and paste them under the gradient map.
And you got the backgrounds!