Rattles and Faded Sub Cover

I had a little extra time the other day, so I figured I would try to tackle a couple of small rattles in my rear deck that I hear when listening to some music. Rattles can be pretty damn difficult to track down sometimes (I often have to do this at work, so I'm starting to get decent at it.) I removed the rear seat, deck lining, sub cover, and d-pillar covers, and then used a tone generator app on my phone (playing through the car stereo) to run up through the sub's active frequencies (this sub runs from ~28hz-210hz) and sure enough, as I went up different parts of the car started to sing. As has been mentioned in other posts here before, there are a couple of wire harnesses that buzz, a little bit of foam fixed those. Some buzzes came from the rear deck itself. My fix for that ended up being taking two layers of the stuff you line your kitchen cupboards with, cut into a sort of gasket for the sub itself. Surprisingly that took a lot of the resonating out of the metal. The worst offender was the center seat belt reel assembly. There are components inside the reel that rattle at 3 or 4 different frequencies, and as far as I can tell there is no way to alleviate it, with the exception of getting a proper sub/amp combo in the trunk. The rear deck is a pretty poor place for a subwoofer for a couple reasons, this being one of them. After I did that, I figured while i have the car apart, it was time to tackle a couple of other small things that have been bothering me. One was some discoloration of the leather on the tops of the rear seat headrests, which was taken care of with some leather conditioner, and the other was the speaker cover for the sub. Over the last 10-11 years it has faded from a nice black/dark grey to a very light grey almost purpleish looking color. That cover pops out of the panel its in and several light coats of Dupli-Color black fabric and vinyl spray paint did the trick! looks like a brand new car back there now, and for the most part, no rattling!
Sorry the photos are links... I'm having a hard time embedding them in my post.

Before:
https://www.dropbox.com/s/yyrb2w4yp5..._1258.JPG?dl=0

After:https://www.dropbox.com/s/m4ddokqnbd...ender.jpg?dl=0

https://www.dropbox.com/s/ia8rb9l1lj...%20AM.jpg?dl=0

The "bass gasket" I made for the sub:

https://www.dropbox.com/s/oxetsmqlgo..._1249.JPG?dl=0