Hmm, just noticed this thread...
Well, I mean, what do you consider cover? I would say the Erdnase/Houdini Change is a covered change (though I'm playing with a streamlined handling wherein the cover is VERY minimal), and the paintbrush change is obviously covered... But I would say it's the fact that their is a PHYSICAL cover there that is the main thing. The twirl change (AKA 'In lieu of the thru the fist change') is 'covered' by the shaking, the shapeshifter is covered by the snap, but their is no PHYSICAL cover.
My change 'The Wave Change' is covered in much the same way as the twirl change, but I definitely consider it to be very VERY open.
CL