This Trick will works in Mac OS X (Snowleopard , Lion , Mountain Lion )

Open up your launchpad from Dock , Utilities folder , select terminal app !

now copy and  paste this command lines to your terminal (* some works needs to be in CAPS thats why i  prefer copy paste )

 defaults write com.apple.dock no-glass -boolean YES 

                                                         Then press enter key 

Then 
                                           copy and paste this command line to terminal and press enter key 
                                                                       

                                                                                        killall Dock

    your 2D Dock is Ready 😀

To Switch 2D Dock to 3D you just need to enter same command lines in terminal and replace YES to NO

defaults write com.apple.dock no-glass -boolean NO

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