Use Appearance tabs
To draw the tabs in the style of the current theme, check this box.
Colour Appearance tabs and layers
To colour-in the Appearance tabs with the colour selected for each layer, check this box.
If you use one of the Appearance layer styles, they will also be drawn in the layer colour when this option is switched on.
Draw gradient on tab
To draw a gradient on the tabs in the docks, check this box.
Reverse tab gradient direction
To reverse the direction of the gradient drawn in the tabs, check this box.
I can't decide which I like better!
Draw gradient for tab background
To draw a gradient in the background behind the tabs in a dock, rather than a plain bevel, check this box.