You'll also need resistors for you LEDs to limit their current draw. You can use this to calculate the appropriate resistor value.http://led.linear1.org/1led.wizNote that you'll need different resistance values for each color.
Thank you so much for your reply!
If i'm using a 9V DC wall charger for my arduino uno, does that mean my source voltage is 9V instead of 5V?
Isn't the forward voltage for red 2.2V and for green & blue 3.4V?
I might be way of, but just checking since you know best!
P.S. Would I need 3 resistors per LED?