Start by applying
a "green to light green" gradient in linear mode.
Duplicate the layer. Press Ctrl+T and scale
down vertically.

Press Ctrl+T. Right Click and select Warp. Select
"Flag" style from the preset warp shapes. Apply settings as shown.

Press
Ctrl+T and scale up.

Duplicate the layer and change the layer mode to
"Soft Light". Move this layer a pixels upwards.
Similarly create more shapes randomly with
different color modes.
Select and merge all the layers except
background layer. Duplicate the layer and move it to the top. Change
the layer mode to "Soft Light".

Duplicate
the layer again. Press Ctrl+T. Right click and select rotate 90°.
Change the layer mode to "Linear Burn".

Move
this layer to left edge as shown.
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