From your iPad. Go to settings. Go to photos. Turn off Photo Stream. And that's it. It still does not solve the problem of being able to delete your photos individually but it gets rid off your photos from your iPad. Hope it helps
Until I came to the one about turning off photo stream on the iPad I was going to say finally a thread about deleting from photo stream that "gets it." Apparently not.This doesn't delete the photo stream, as soon as you turn it back on it will re-download the photos from the stream unless you've reset it.
I know you can't delete single photos, so how do you delete the entire stream?