Ah the Leopard Dock, such a point of contention among the Mac crowd. Are you with the 3D effect or against it? Anyway you like it, it's what you'll have to put up with on Mac OS X 10.5, except if you decide to use a dock changer. DockDoctor is such an application, born from the success of the similarly named widget.
This application will allow you to add a rainbow touch, grass feel or dark glass look to your Dock, or more. DockDoctor has eight different dock looks to choose from. The application also allows you to switch easily between the 2D and 3D views. In all, nothing really revolutionary, but a fun utility if you like adjusting your interface. While we would have liked to see more options and possibilities, the ones made available in DockDoctor should satisfy most users.
DockDoctor lets you customize the 3D Leopard Dock with all sorts of different looks.