It only took three weeks of owning the car to finally change the stock head unit. I did tons of searching and finally picked up a Kenwood DDX-616 because it has everything I need and doesn't cost too much. I put it in Thursday night and it was the easiest headunit install I've ever done. It makes the stock speakers sound 10 times better but I'll be changing them out for some components soon.
This is right after I finished it late that night.
Night shot just to show how the interior lights match up. The headunit illumination can be changed to any color you want. I chose red for now because of the A/C controls.
The next afternoon after I got the ipod hooked up. It was cold and I was tired so I left the microphone dangling until I figure out exactly where I want it.
The installer at the shop where I got the dash kit sold this to me for $20. He built it himself for his friend that owns an 09 WRX. It fits perfectly up on the level part of the trunk and has plenty of room for amps between the box and seats. It'll hold two 10" subs that require between 0.8 and 1 cubic feet of space.
Not really an interior mod but I wanted to show it off. I took a picture of my bike (05 ZX6R) and traced it onto some green vinyl.