2D Dock Files!!! :D

So I was astounded on how the new OS X Yosemite looks like, and I wanted to make a skin for yosemite. I was almost there and then I stopped at the dock. I know how to make it 2D on the bottom. But how do I change the color? So I mess around with the Dock a bit. And I found it. The files for the 2D Dock:
bottom1.png
bottom2.png
bottom3.png
bottom4.png
bottom5.png
These files are the key for making that dock. So sonn I'll post a new thread on a Yosemite Skin. I hope you enjoy customizing!

-SkyverseYT (Minecraft Gaming Youtuber)

Update

So... I thought I figured it out... I didn't. So you can change the corners but the fill is generated by the Application itself. There's ways to work around it though. New update once I find it.

-SkyverseYT (Minecraft Youtuber)