So I finally broke down and made a bigger version of Aurora 9x18, Aurora 18x18.
Just as the name implies, it has twice the number of LEDs. The overall dimension is seven inches in diameter. They say bigger isn't always better, but in this instance bigger is indeed better.
*** The kits and PCBs are available at http://www.theledart.com/blog/aurora-18x18 ***
Step 1: Background
Aurora 18x18 is built upon the same foundation. Special PWM technique enabling just one microcontroller to control 18x3(R/G/B) channels of brightness levels, without specialized LED controller ICs.
In addition to doubling the number of LEDs, Aurora 18x18 has a built-in infrared remote receiver. Now you can control this beauty from across the room, without leaving your chair.