Modify Blizzard UI Textures?

Hey!
Does anyone know how to change the texture colors while still using the standard ui?
I want the actionbars, minimap and castbars to look something like in this here addon: http://www.wowinterface.com/downloads/info24007-SUI.html

Do I have to learn how to write code and stuff to make that happen?
Or is there a texturepack somewhere that I don't know about that does this?
Bump

Does anyone have a working code for this?
Dark or even black textures like SUI or LortiUI.
I would use SUI but I don't like the flat color on the raidframes and the increased sizing Im not fond of either