Took the lazy way out and installed caliper covers instead of masking and painting. Found a company here in Chula Vista, CA that'll make caliper covers for the CT in various colors, powder coated and can even engrave them with your favorite graphic. They have a nice looking Ultrasonic Blue for Lexus. Opted for black as I have enough blue as it is on the car.
Here's how it comes:
Here's how it looks in the wheel, front and back:
Final look: Darkens everything nicely behind the wheel, giving the wheels more contrast.