they are pressed into your headtube, one on the bottom, one on the top. then your smaller headset (and, therefore, smaller fork and stem) are pressed into the reducers.
i don't have any pictures, but it looks... alright. especially if you have a newer style black headset (as opposed to something "classy" it kinda looks like there is a spacer between your frame and headset, and obviously your headset is going to look smaller in proportion to your headtube.
it might be better to ask in the mechanics forum. even if this is going on a fixed gear, it really has nothing to do with fixed gears or single speeds. you are much more likely to get people telling you how stupid it will look and generally insulting you than actual help