Creating chocolate and caramel style left navigation panel

Start by creating a square frame using custom shape tool.

Double click the layer to open layer style window. Apply settings as shown.

Create a rounded rectangle using rounded rectangle shape tool. Apply same layer style.
Double click the layer to open layer style window. Change settings in "satin" as shown.

Duplicate layer and place below each other.
Select and merge all the layers. From filter menu select Liquify. Select forward warp tool and distort shape to create a molten chocolate effect.

 

Duplicate the layer. From filter menu select texture>>mosaic tiles. Apply settings as shown.
Change the layer mode to "Difference". Reduce the opacity.
Type navigation links over these buttons.