different ways:
easiest: delete the icons you don't wanna see from your desktop folder
for non removeable icons like Workspace, Network: in one file of ghost (I think he set it into skinbase.rc) is a line called:
xLabelDesktopAutoCreate or xDesktopAutoCreate
uncomment the line out and delete the Desktop icon lines you don't want to see from your
/Ghost/config/step.rc