Just install "gnome" package. You can choose during login which desktop you want. If you like, you can mix gdm/kdm (login manager) with Gnome/KDE desktop somewhere in configuration or install only neededed components like ssession-manager or window manager, but for trying install all. Also you can run appliactions written for Gnome on KDE desktop and vice versa.
Last edited by eSelix; 12-09-2011 at 04:01 PM.