If you have a Speed6, your headlights are HID. They should already appear bluish. If you want to change out the parking lamp bulbs, they are type 194, and you can find replacement styles/colors at most auto parts stores that have a "performance" section. Autozone and Pep Boys both carry colored 194 bulbs.
Be careful about putting "pure blue" bulbs on your car though. In most states, anything except amber or white are prohibited on the front of the car.
The 194 bulbs that you guys are talking about....are those the bulbs that reside in the same housing as the high beams in the headlight assembly or are those the bulbs that are on the side of the car near the wheel well.