You may set the Pad color by sending this SysEx message to "Arturia MiniLab mkII" MIDI output port
F0 00 20 6B 7F 42 02 00 10 7n cc F7
where:
n is the pad number, 0 to F, corresponding to Pad1 to Pad16
cc is the color:
00 - black
01 - red
04 - green
05 - yellow
10 - blue
11 - magenta
14 - cyan
7F - white
The problem is that once you press the pad the led will go off. To get around you may send the above message through a MIDI translator.
It would be useful if the MIDI Control Center has the option of not to change the color of a pad when pressed