I would just pick names that I liked. (m)
And if they were "matchy" so be it. DH and I already have a set of names picked that we really, really like and that we've agreed upon. So, if I found out tomorrow that I was pregnant with twins, their names are good to go ;)
Rhyming names are a little too much for me, though. The names that we've picked aren't rhyme-y but have a few little quirky similarities. I knew twins named Larry and Gary. I felt so bad for them.