If you're carving out a new bathroom in a small house, or renovating an older bathroom, you tend to get familiar with building codes pretty quick. In Boston at least, codes say that bathrooms (even half baths) need to have an exhaust fan installed even when the bathroom has a window. If you're not involved in picking out the fan (and who would be?), the plumber is likely to put in a big square thing with a grill. In a small bathroom, this can be a bit ugly, not to mention make a ton of noise. We did a bit of research for an old bathroom we had to bring up to code and found a great vent fan that's also a recessed light...
We would have loved to have taken photos of some of our UFO-looking bathroom fans from past apartments. They had these big grills that collected dust and there was no hiding them. But this recessed fan light from Broan/NuTone was a revelation to us because it's actually also a working recessed light and doesn't stick out at all. It's quiet and unobtrusive and even UL Listed to use over a bathtubs or shower. We love that we never even know it's there. Now the next time you go into a bathroom you're going to notice the vent fan.
>>> Broan-Nutone website
>>> Recessed Fan Light - Model 744