I've been using a pair of Creative EP-630s for about 4 years. Last week, the right earpiece stopped working - the conductor had broken at the plug.
The fix was easy (replace the plug) but I decided to spruce them up a bit as well.
I went with a Neutrik plug since I had one on hand, and added a paracord sleeve. I used the rubber cover of the original plug as a stress relief for the Neutrik, which IMHO turned out pretty well.
(original plug on the bottom, dissected to check the wiring).
The Creative logo and the L/R markings on both earpieces were almost completely worn off, so I needed another way to tell the left earpiece from the right.
I found a few colorful rubber rings in a drawer. Some of them fit nicely behind the earbuds, recognizable at a glance, but out of the way.
I used a red one for right and a blue one for left. I feel they also improve the seal a bit, if only by preventing the edge of the earbud from wrinkling.
These rings came in a sample pack, labeled as "Neoprene Rings, 16 Gauge 1/4" ID". Rings like these can be found
here.
For the Y junction I used some heatshrink tube, and added a removable clip.
Here they are with my portable setup (iPod Video 5.5G 30GB (running
Rockbox) -> Passive Crossfeed Filter
(Modified Linkwitz, Low Z version) -> EP-630)