Make a texture that looks like grass

Step 1

Firstly create a new image in the size of your choice ( i used 200x200 pixels ). And press D to reset your colours

Step 2

Now go to Filters -> Render -> Clouds, and then Filter > Stylize > Find Edges

Step 3

Now invert the colours by pressing CTRL + I or going to Image -> Adjustments -> Invert

Step 4

Then go to Levels by pressing CTRL + L or going to Image -> Adjustments -> Levels and put the input levels to: 0 , 1.00, 35

Final Image

Now to add some colour go to Image -> Adjustmensts -> Hue/Saturation ( Ctrl + U ). Ive added some extra features, and you can do the same, but your final image should look along the lines of this one.