I want to change the color of all of the LEDs in my car to blue, how would I go about doing this? Do I have to change the bulb itself, if so, where can I buy new blue bulbs?

 

look at the How-to sticky!!!

 

In short:
Whenever you are replacing an existing LED, just remove the old one, and solder in a new LED.
Whenever you are replacing a light bulb, replace with an LED and a resistor.
New LEDs can be bought from ebay, or from sites like www.superbrightleds.com
The 4th-Gen HowTo's will give you someplace to start.

 

I cant seem to get my LED turn signals working wven with the resistor. IT says to wire the resistor 1 wire to ground the other wire to the postitive. wouldnt I supposed to wire the resistor in line on the positive?

 

Yikes.
The resistor should go in-line either on the positive side or the negative side (doesn't matter).

 

thanx guys

 

here the instructions for resistors on the superbrightled.com site

CONNECTION INSTRUCTIONS: Using includes splice taps, connect one wire to ground and the other wire to the turn/brake wire. You do not have to cut your car's wires. Squeeze splice taps with pliers. One Load Resistor required for each turn signal bulb. No instructions are include with these kits.