[Pharo-users] accessing themed colors from morph

Hi, how is set the background color of a morph? I could access directly "Smalltalk ui theme backgroundColor" from within the Morph, but I don't see anywhere that something is using themed colors this way. So I assume there is some other way; what am I missing? Note that I don't want to use the color for background of the morph but I need to make a decision based on the color in the morph. Thanks, Peter