Replacement icons.

To replace the original images simply navigate to your InsomniaX application and from it's context menu select Show Package Contents.

From there, navigate to Contents > Resources and drag the replacement icons into that folder. If you want to keep the old icons simply rename the originals unloaded.png and loaded.png before dragging the new files in.

When you've done all that restart InsomniaX where you new icons should await. Enjoy!