Yes, quite a few asymmetric pad designs.
The Canterbury/Ayrtek designs were memorable for being quite leftfield (not as much as the Aero P1s I guess when they first came out - is it really almost 20yrs ago??). Did Canterbury/Ayrtek also have some funky glove design with an air pump incorporated? Were there some old pads that incorporated air cushions before the gel revolution came round?
Could some kind of hybrid designs incorporating old technologies be useful in the quest for lighter weight, more protective pads, or will pad designs go down the route of kevlar/body armour?! Any thoughts?