
In this tutorial I’m going to show you how to create an effect like this and this. Very simple and short. Some of you will recognize the tutorial.
Step 1
Start with a new file and choose any size you want (I took 560×226). Paint the layer black and create a new layer (!).

Step 2
Get some brushes from here and install them. Now set white as foregroundcolor, choose one (or more) of the brushes and add them by clicking on the image.

Step 3
Duplicate the layer, use gaussian blur (~5px) and set the oppacity of the layer to ~40%.

Step 4
Create a new layer and use the big 300px brush with 2 colors you want to paint over the picture. Take care: The 2 colors have to be in the same layer!

Step 5
Set the layer on color and create a new layer (and press D! - black and white as colors). Use render -> clouds and then the gaussian blur (about 10px). Set the layer on vivid light. Your result should look like this.

Optional Step
If the glow isn’t strong enough: Take the 100px pencilbrush, set white as color and set the oppacity of the pencilbrush to ~20%. Now you can add by simple clicking very nice highlights (same works with black as color).