Here's what they'll look like on your car, Mr. President.
https://farm2.staticflickr.com/1595/25963881523_8680b86cd8_z.jpg
I did a buncha research on them before deciding "oh what the heck, I'll do it" so here's what I came up with.
Wheel Spacers are GOOD if you get hub-centric spacers, if you want to widen your track a little without getting wider tires and wheels, and if you change between seasonal tires (summer and winter) and take 'em off every now and then.
Wheel Spacers are BAD if you want to take it to the track or autocross, if you plan on leaving them on for a long time, and if you are allergic to manual labor (that last one is kinda just me being silly trying to come up with a third reason).
If it's just for looks, you'll be fine. I don't recommend running them for long periods of time. When I switch back to my winter setup, they'll come off, so I'm not worried about it. Some people add spacers for "performance", but they honestly don't contribute enough to outweigh the stress they put on your suspension and bearings.