Take a look at the US Social Security's list of popular twin names for 2004:
http://www.ssa.gov/OACT/babynames/twins2004.html. Curiously, it doesn't seem to have b/g twin sets, unless you speculate on the so-called "unisex" names listed.
My personal favourites are
Mia and
Mya and
Jacob and
James.
Miranda
Proud adopter of 15 punctuation marks; see my profile for their names.