To change the colour of the dock in Leopard.
Go to System > Library > CoreServices > Ctrl + Click Dock > Show package contents > Contents > Resources.
In there find 4 .png files named scurve-l.png, scurve-m.png, scurve-sm.png and scurve-xl.png.
Make a backup of them incase you make a mistake and want the old dock colours back.
Open the images and change the hue/saturation/colour/brightness or what ever you want in Photoshop (or any other image editing software). Make sure you apply the same effect to each image or it wont work properly.
Drag the new 4 .png's back into the Resources folder (you may have to drag them individually as it requires you to type your password each time).
Finally restart, or simply go to Terminal and type "killall Dock" (without the quotes) And that's it.
For the Apps folder, just put a new folder in the apps folder, name it 00, and make the icon the same as the app one. Not a very neat way, but works.