...the ability to selectively choose to never, ever see certain userpics while I'm logged in.
You could grab the little tracking numbers, go to the "I never want to see this usericon again so long as you save my options" page, and enter it, and from then on, you will see a "Userpic blocked" small message instead of the inappropriate userpic.
I mean, I could do without "Voice of a angel" blinking at me, should that user decide to post a gabillion times in that community, and I could quite frankly do without that one Krang userpic of melcocha
's, and there are probably people who don't need to see my late purple vibrator shaking itself, even though the hidden joke is that those batteries in there are really Pikachu batteries.
Since LJ's thing is to provide a pretty cool service for everybody, and a really spiffy service for those who pay for it, free users would maybe only get to block three pictures, and paid, early adopter, and permanent would get to block more.