I attached a PDF file with my home-brew dome light comparison. After doing a little un-scientific bench testing between the factory FJ festoon bulb, PIAA festoon bulb and the Oznium 20-LED......

....I chose the Qznium. I like em so much I put them in the front and the back domes. If you decide to do the mod, make sure you get thin ones.
Heres the link to the "Oznium Thin flex lights":
The Slimmest LED Dome Light on the Market!Oznium: Flexible Super Thin 20-This is what I ordered: LED Dome Light - White, Large , $29.99 each. I believe that the colored lights will not be as bright as the white.
Caution note: These lights are thin and flexible and will fit the stock FJ domes without a problem. Don't be tempted to trim them to fit other dome lights. If you trim them you risk severing either individual LEDs or whole rows of LEDs.