While the default firmware in the Rapid-I isn't half bad by itself, there are more things you can do with the keyboard than what Coolermaster thought of. With this hack, apart from playing Snake, any programmer can theoretically think up effects to run on the keyboard. I hope I even made it a bit safer to use too: the requirement to physically press a combination of keys should make it harder for anyone malicious targeting this keyboard.
As usual, the code I used to write this is open-source: the firmware dissection and update tool is licensed under the GPLv3 license, the Snake hack and other code that's running on the keyboard itself is under a Beer-Ware license. I had to clean all the Coolermaster-owned code and binaries out of it for legal reasons, but you can pretty much rebuild that by downloading the 1.1.7 firmware update for this keyboard and letting the code dissect and rebuild that. The hack, at this moment, only is tested for US keyboards, because that's the one I have. You can grab all the sources here.