Aphabet:
(sorry for the wait delay my reply!)
The 12v modules can be controlled from your 5V Arduino, no problems. Make sure you use the same wiring as the smal modules, ie blue=GND, Red=12V from power supply, yellow=data, green=clock. Connect the GND from your 12V to the GND on the arduino.
I have some different 12V modules coming soon, too. They are similar to the 50mm domes, but are square shaped. I'll post a pic when they arrive.
For those using the strips, I've amost comompleted an Arduino library to simplify the task and demonstrate the required sequences. I've post it here in the next 12hrs.