A Quick Way:
Once logged into KDE do this:
Press ALT+F2
In the dialog type 'desktop'.
A drop down list appears--- now click on desktop effects.
Next, go to Advanced, in 'compositing type' change from Xrender to OpenGL. Click on Apply.
Now go to the 'All Effects' tab somewhere on top. Scroll down and enable whichever animation you want....desktop cube/animation/wobbly windows/slide/explosion etc etc.
There is even a choice to show kwin FPS just like in compiz.
NOTE: For these animations to work, you will need to install proprietary graphics drivers for AMD/NVIDIA. Open source gallium(nouveau/radeon) 'may' not work with opengl. I see no problems with Intel video, they have the best drivers, unless you are using Ivy-bridge/haswell.