Spark contact layout, design, and icons

Hello, I notice there is some *.jar files may contain all the graphics in png format. We wish to make some changes to images but also to colors for spark.

We think spark is good, but the design, colors and icons not look so corporative. We have a PNG file with the look and feel of a corporative image, icons and colors are more plain like Live Communicator 2007.

We can split the PNG to fit all the png in the *.jar files. But seems don’t work for all the files. We don’t want to brand the product but we want to change the design colors, images based in the original.

There is a program to create skins? Long time ago I used a program to create WINAMP skins. You just select a file with the player dimensions and automatically create the image file and the compressed file with the images.

There is possible? Or there is a reference to the design files?