Here are a few of links I found today while perusing the web. Some of these things could be used for "softer" NG interface designs.
Please keep in mind that these are .ICO, not .BMP or .PNG. You will need to find an image editing tool that can open these files as the .ICO format has a transparency layer, but this layer is NOT like the .PNG transparency layer. However, if you find a tool and convert to .BMP, you will most likely be able to use the Top-Left Corner transparency.
[Link: interfacelift.com]What's cool about this link is that they have a 3rd Party Hardware section that has images of XBox, GameCube, etc.
[Link: interfacelift.com]http://www.iconkits.com/Check out the 'Full Preview' zip files on this page. These zips have .PNG files in the zip.
[Link: interfacelift.com]I must add that graphic designers put heart and soul into their work and most often go to the trouble to copyright. There may be copyright laws also associated with these images. By providing the links here, I will not be held liable for any misuse of anything downloaded from the above links.