Learn to create a damaged cell effect...

Step 1

Create a new document, i have used sizes 200x200 pixels. Press D to reset your colours

Step 2

Go to Filter>Render>Clouds

Step 3

Then go to filter>render>different clouds and then repeat this step.

Step 4

Then go to Filter>Sketch>Chrome, use these settings

Step 5

Then filter>stylize> find edges

Step 6

Now invert it by pressing Ctrl+ and I

Final Image

And finally to add colour simply press CTRL+ U and your image should look something like this..