Actually, those pictures are quite mild if you have seen serious ball play. One of my BFs in NYC used to hang all sorts of weights from mine. It actually feels rather nice. The thing to note is that this is ball PULLING or STRETCHING, not ball SQUEEZING, and when the BF confused the two, I let him know in no uncertain terms. How may guys just want to have a nice set of low-hangers? Ball stretching may be an effort to get there, just like cock pumping...
Real ball torture, on the other hand, invoves things like ball squeezing. One can buy ball crushers, which use screws to crush the balls between metal jaws when tightened. Others have the jaws made out of thick plexiglas, so the crusher can see the crushee's balls spread out as the thing is tightened. Other versions of these also include electrodes for electrostimulation. Then there are things like temporary ball piercing, nailing the scrotum to a board, scrotal inflation, etc. Now we are getting into the sick things!
For the strong of heart, check out this ball crusher with electrostimulation offered by Chase Union:
http://www.chaseunion.com/cat2/index.html, and select "Visible Ball Crusher" or "Cock and Ball and Ass Toys." At S/M fetish events, the vendor market will usually have devices making even this look rather tame.
There is a whole genre of ball torture porn videos. My ex used to get very excited about this one where the guy shot a big squirt of cum each time the screw was tightened.