simple 2 panel interior door. with a modern styled home I think either a 2 panel door or a flush door looks best, though in a pinch there are some great 5 - 6 panel doors that could work as well. but for me it's always best to keep it simple.
Use base moulding on casing to transition from base board to door casing
$3200 Classic Series Mahogany Solid Wood Front Entry Door - Single with 2 Sidelites - DB-095 2SL
double pocket doors
Sliding pocket doors in white. Eventually used in a new build. We have a regular door like this (in espresso) on our pantry and we LOVE it!!
black interior doors with white trim and gray walls