Designing a cool friendship day card

Start by filling the background with a solid color.

Select brush tool. Press F5 to open brush settings. Select "Dune Grass" brush from preset brushes. Apply settings as shown.

 

Create a new layer and apply this brush covering whole area of the document.
Switch to a different foreground color and apply the brush as shown below.

 

Duplicate the layer and change the layer mode to linear burn.
Select and merge both layers. From filter menu select brush strokes>>sprayed strokes. Apply settings as shown.
Duplicate the layer. From filter menu select blur>>gaussian blur. Apply settings as shown.
Press Ctrl+T, right click and select rotate 180°. Change the layer mode to "Lighten".
Type friends using an elegant font. Apply some outer glow layer style.
Type rest of the message using a nice font.