There are 144 basic colors to choose from (out of 16 million colors
 available)

Each color can be mixed as gradient with another color (make for
 144x144=20,736 combinations)

Each gradient can be made to show horizontal or vertical (this
 doubles our combinations to 41,472)

Now add solid colors (144+41,472=41,616)

Now add another 809 image banners we allow editing of 
(809+41,616=42,425)