I've also painted old stained trim with no regrets. I did not strip it all (tried at first, but it was very aged and too difficult even with chemical strippers and heat guns!)- I simply sanded and used high quality Ben Moore primer and paint with excellent results. I personally much prefer white-painted trim to stained, UNLESS the house is of unusually high build quality. I come from a family of architects so am probably a bit overly-sensitive to proportion and design, so YMMV... but I feel like stained trim really calls attention to each element: doors, windows, baseboards, crown moldings are all brought into high contrast with stain and their placement and proportions become important design elements in a room. If they were well and thoughfully designed originally, that can be a beautiful thing. If not -I'd paint them. Our last house was a 1926 Foursquare. it was definitely much better built than most homes today, however, it was probably a Sears kit house originally, basically a builder-home from that era. i.e. not architect-designed like the previous Victorian I'd lived in. It had stained fir trim (with nice details) throughout, and DH and our friends thought I was crazy to paint it. Guess what? The house looked SOOO much better after I did. It actually became a much classier-looking house. The dark wood around doors and windows -which had been placed pragmatically rather than for aesthetics- made the house seem a bit akward. The white paint allowed the really GREAT elements in the house, like it's gorgeous birch floors, ample sunlight and great "flow", to really shine. Just my 2 cents!

If you don't have stained wood doors, then you have painted doors? If so, then you can paint the inside of the front door the color of your other painted doors, or you can paint it the color of the walls. Either would be acceptable and cool.

Well...of course you can do anything you want. But...since you came here for advice, here's some ideas: Generally speaking, mixing painted walls with stained trim and/or doors is not always a good design idea. Why? Because there's simply too much contrast and competition between the two distinctly different materials and finishes. Each (stain vs. paint) fights the other for visual dominance and importance. It's always a battle to find a design solution for stain AND paint wall surfaces which harmonizes and isn't an eye-magnet. It can be done, but it takes a great deal of talent and experience to bring it off. What to do? You cannot go wrong by matching materials and finishes. Painted walls with painted trim and doors. Stained walls with stained trim and doors. This design approach unifies and ensures harmony on your walls (unless you're into the "Color of the Month" syndrom, for which there is simply no possible help). Hope this helps. Good luck!

If you are talking about real wood think about maintenance. We had a stained mahogany door at our previous house. The sun did a number on it and it had to be redone yearly. It was even under a covered porch but the front of the house faced east and the sun still came under the porch and torched half of the door. Went with a painted door in current house and the front faces west and the door still looks good. It is under a porch as well. As beautiful as wood doors are I would not do one again.