Hi DJE. First let me say I am not a DJ, but some of my favorite color combinations are:
Yellow(Red and green at full) White(White LED at full, not using RGB) and Orange (Red at 255 Green at about 65)
Orange (same values as above) And Blue (Blue at full)
Lime green (Red at 57 Green at full) and Pink (Red at full and blue at 114)
I don't really think these apply to weddings but you never know.