If you have downloaded the OD program and installed you will need to unzip the Ktec items in to the OD backgrounds folder, In vista its My doccuments/Stardock/Object dock library/Backgrounds. once the K-Tek stuff has been unzipped to the Back grounds folder,
For non tabbed docks: , right click anywhere on it or the tab dock and select "Dock Settings..." A new window will open. Here you will select "Appearance" in the left side menu. To the right will now show "Background" this drop down menu will have all the backgrounds you installed, as well as the default ones.. Select the one you wish to use and it will auto apply. Now close the window and you are done..
For Tabbed docks: Right click on the "tabbed" dock. (This is the dock section with the Text tabs at the edge.) In the drop down menu click Tab Settings... This will open a configuration window. In the left side of the window select Tabs and styles. Towards the bottom you will see "Style" the drop down will show all backgrounds available. Select the one you want and it will auto apply. Now merely close the window,and your all done with the tabs .