The biggest problem with doing this is not one manufacturer makes everything. You can't get the same color tape, cables, saddle, hoods, and cages from one place.
I think a black saddle and dark blue cables, cages and tape. White is nice but shows dirt too quick.
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“One morning you wake up, the girl is gone, the bikes are gone, all that's left behind is a pair of old tires and a tube of tubular glue, all squeezed out"
Sugar "Kane" Kowalczyk