Adding Noise to an Object
Photoshop CS6 Tutorial
How to Add Texture Noise to an Image in Photoshop
Some level of noise appears in most imagery. If you are editing an image or adding elements it is important that you match the existing noise.
Open an image in Photoshop (File > Open).
Using one of the Shape tools, add a shape that you want to composite into the image. Adjust the color and saturation to blend with the image.
Right-click the shape layer and choose Rasterize Layer.
Right-click next to the shape layer name and choose Convert to Smart Object. This will allow you to change the noise settings multiple times.
With the shape layer active, choose Filter > Noise > Add Noise. Adjust the noise setting to match the existing image noise. You may need to zoom in on your image to determine the correct noise setting. If necessary, add a slight motion blur to the noise (Filter > Blur > Motion Blur).
To make the object blend into the scene try adding a Drop Shadow and an Emboss layer style (Layer > Layer Style > Drop Shadow).
You can access any of the filter or layer style settings by double-clicking the filter or style name in the Layers panel.