01 – Make a new document
and make a new empty layer and delete (or hide) the background layer. Make a new layer after that.)
02 – Select the Marquee Tool
and create a long rectangle the entire height of the document.
03 – Fill the rectangle with a color of your choice
Making sure you’re on an empty layer.
04 – Duplicate the layer of the rectangle
and then right click the layer > blending options
05 – Go to the Color Overlay options
and make the color any color of your choice.
Move the new rectangle
so that it is next to the other rectangle but not overlapping.
06 – Repeat steps 04 and 05
until you are happy with the results.
07 – Go to Filter > Distort > Wave
and make your settings like mine for a subtle wave, or change them up for a more exotic wave.