To brag and boast, I just bought a second pair that comes with the good and clean looking, hopefully good sounding velours like here. The 250 Linear pads are not up to snuff in my opinion. Eventhough the low is a liiitle boosted it somehow sounds a bit off with those.
The earpads in your link are not the velours. Those are the original HD540 (i.e. mark I) pads. Both the black sides and white surface are made from woven fabric (slightly different types). The white area was originally covered by a pleather-like vinyl material that has flaked off with age, exposing the fabric beneath it.
The velour pads that people are describing are entirely covered in black velour, like these.