I used to use grid plus an addon called grid indicator icon bar and i was wondering if there were any addons that had taken it's place or if there was a working version floating around.
Just to help explain if you've never heard of it before grid indicator icon bar would add eight icon slots to your grid frames (for a total of 9 icons at any one time showing, each icon individually customised) and i used to use this to organise showing different types of debuffs (like one for physical slows/snares or stuns and others for cc etc) which worked out really well for me.