A nice lesson is about searching the composition from basic PS effects and filters.

Start. Create new document. 1024x768 px.



Use gradients on it.







We did it 2 times + 2 different layers.



Now make a copy of one of the layers, making it 3 layers.







Use Wave filter on the top layer.







And set the mode to the layer.



Now I want to use some layer styles (on the top layer).







I've created a new layer and used another gradient on it.











Note the Mode is set to Color Burn. See the result (with wave filter).