Yeah, doing them on the sides should work, not sure how well it will light up things. Doing them in the bottom, it helps hide the led so it couldn't be a distraction.
And I got my leds off ebay. They are prewired and already have resistors
Tha Kraken: http://www.focusfanatics.com/forum/ford-focus-builds-general-showroom/285082-meet-kraken.html