Material on GUI Transparent problem

Hello everyone. i wanted to add a transparent image on GUI, but as far as i know, i can make transparent images using material - transparent- cutoff....

and GUI.Label wont accept materials. (ex. var icon : Material; GUI.Label(Rect(0,0,0,0), icon);

is there any other i could combine those 2? i mean use the material as GUI. or any other way where GUI can make image transparent?