It comes with two color, silver and black to match your X100 body. Check out the official site: http://www.fujifilm.com/products/digital_cameras/accessories/lens/conversionlens/x100wideconversionlens/
Also, remember to update the latest firmware, so you can turn on the wide conversion lens option in the camera settings.
Let's check out some samples here:
(Left: 35mm, Right: 28mm)
28mm (Direct JPEG):