This tutorial using openSUSE 11.1 KDE 4 LiveCD. You may try with another iso (Gnome as an example) or build a brand new iso by using KIWI.
Although it was not using GUI application, making openSUSE 11.1 LiveUSB is not too difficult to do. Below is a step by step tutorial about “how to make openSUSE 11.1 LiveUSB” :
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