I can barely, if ever, hear the difference between cables, but pads are almost always an obvious change. for example, I commonly use Branwaze Hybrid Angled pads on my TH900, because I prefer the slightly more mellow sound and the confront of the velour.
I would recommend that if one wants to change the sound of a headphone without using EQ, pads are a much more economic way to do so over cables, DACs and amp (assuming one has a good amp and DAC).
Once someone figure out how to 3D print the plastic ring that the Utopia/Clear/Elear use to attach the pads, a whole new world of sound signatures will open up.