Whether it was because of Apple reasons ("we are too focused on a small number of sure winners...oh and a G4 cube") or HP/Dell reasons ("we are really into playing it safe"), there were just few companies that could do things like Sony could.
I think it takes a certain amount (if not an outright surplus) of engineering hands and manufacturing capacity to be able to do experiments like Sony's VAIO division did. Think of the truly bizarre and occasionally beautiful devices coming out of Nokia in their mid-2000s peak, or IBM in the era of their "butterfly" keyboard..
If you look at those key ingredients for what it takes to "get weird with it" (those surpluses of capability and capacity), I'd say the next ones to get weird with it would be Samsung (need I remind you Samsung has in recent memory tried a Galaxy with a curved screen, a Galaxy with a mini projector...), LG, and a whoooole bunch of Chinese companies we probably haven't even heard of yet.
But today, we take Sony off that list.