Dock and Mac Theme help

I am new to the Mac OS.
just needed some help from fellow Mac users.
i downloaded a theme from a website .... its the ileapord theme.
the download was a .dmg file and i installed it into the system ... but after installing i didnt see any changes ... please guide me as to how i select a theme after it has been installed.
Furthermore i also downloaded a Dock from a website ..... this download was a .zip file and when i uncompress it, i get a folder named resource. Please guide me regarding this as well since i don't understand what i am supposed to do with the folder.

Thanking in Advance whom so ever helps me out or even tries to help me out.

Regards,

Omer

What OS do you have?

If you want to get into 'themes' you'll need Shapeshifter: [unsanity] ShapeShifter - Change the look of Mac OS X by applying themes and more!

thanks for the feedback ...
anything about the dock ... i have .icontainer files.
how can i open them ?