I think it was 2008 & 2009 (or 2007 & 2008) where USC & UCLA wanted to both wear their home jerseys because it's how some of the past games used to be. But they didn't ask for approval before the season or what not. Anyway, one year, the one team was penalized 15 yards before the game on the opening kickoff, but it was agreed upon by the schools that it would be declined so they could both wear their home jerseys.
As for the combos, I think all will look. I like the look of the gold & maroon pants with the white tops, but I think the white on white is kind of bad ass.