I don't like twins with to matchy names, but a subtle theme is nice. I like
Ignatius &
Blaise.
I'm not very good at this, but how about:
Raphael and
Gabriela (after the angels)
Ophelia /
Cordelia &
Iago (Shakespeare)
Felix &
Hillary /
Ilaria (meaning)
Isla &
Ignatius (same initials)