I've really come around on the blue and whites the last few years. I would love those as the throwbacks. My biggest problem with the current set is that they're too dark. The blue/yellow are a bit brighter, but they're more noticeable. The dark blue and gold just doesn't pop as much as the old jerseys do.
I do not want them to go red/black, I think that's just too radical of a transformation.
I would love to see the horns back on the sleeve, as well. I don't know if it's possible at all but if they were to somehow combine the yellow/blue/white of the 60's-90's area, it would be awesome. And yes, I know the 70's-90's had all three of those colors. But what I mean is they could do something like, say, the blue/white horned helmet, then have blue/white road jerseys but accentuate everything with yellow. Don't feature it. Something along those lines (kind of like the Blues do right now).