Actually, they aren't really blue. The are the same pads that are on the HD580s. (I did say poor image quality) And the old ones are on for a reason. The way they are currently set up is to reverse the bowl pads, and then place the senn pads such that the plastic part fits around that indentation that holds the pads on. And it's a shame that you think they are ugly, because they are the best sounding headphones i have ever heard. Period. (I haven't heard the R-10, but i have heard the Orpheus) The sound remains very much the same, with a few differences. The biggest two differences are the bass and soundstage. The bass goes MUCH deeper, easily as much as the HD580. And at the same time, the bass is never boomy, it still has all the punch and tune present in the HP-1, just deeper. The soundstage is also much wider, about the same as the HD580, and instruments are better imaged and separated within the soundstage. The sound in general is more coherent. Also, the midrange is just a touch sweeter.
And to the point of taking off the old pads, it doesn't sound right. With nothing but the senn pads, the sound is much more bright and brittle. By placing the foam from the HD580s over the drivers before placing on the pads, the sound is better than without anything. Still the sound is not right, the bass and soundstage are there, but the midrange and treble are very much veiled. Leaving on the bowl pads and then placing the senn pads over them yeilds better results, but it still lacks something in the midrange. It isn't veiled, but sounds slightly recessed in comparison. With the bowl pads reversed, and then the senn pads placed over them, the midrange becomes just as rich as before, and they retain all the benefits of the enhanced soundstage and bass. Also, they are just as comfortable as my HD580s.