Usually one can deal with morphs by doing the alt-shift-click on them, so that we get the halos and do whatever.
Now, some morphs do not want to let you do this (like the Pharo image on the desktop background) - or you just don't see them as they are leftovers from experiments. A shift click (on Windows) brings a "find window" popup where you can select what you want, no matter what. Try to pick the ImageMorph in there for the Pharo Logo. Phil