I don't think twins should get any other names you wouldn't give two brothers (or sisters, or a brother and a sister) a year+ apart. So I would use my top two combos for each.
BB:
Kenneth Clark and
Miles Eugene (
Miles is a work in progress)
BG:
Miles Eugene and
Katrina Clare
GG:
Katrina Clare and (well, we hope we don't have two girls, 1) because we want boys and 2) because we don't like any girl names)