We have different kinds of doors in our newish home. All are the same wood and stained the same though. Most are six panel, though one is a six panel bifold with the flat areas painted in chalkboard paint. That's our pantry door. We also have a bifold door on our upper level laundry room. It has two lower panels with the top panels being louvered for venting. I don't know if that helps you are not. Do you have a floor plan you can share and show where these different doors are? I know Victorians use to do their private areas with simpler materials to make it possible to be able to use more extravagant materials in their "public" areas for show. Is that what you are hoping to acheive? I know we've thought about not taking the time to route the trim (we're still finishing our home) on the upper level to save time. It's more practical.

One of my biggest pet peeves is when houses have different hardwood, especially when the two floors meet/touch. Weedy acres pic looks good, that wouldn't bother me... I just remember walking thru homes seeing real hardwood and then it's touching laminate wood or other hardwood, drives me nuts. You have two levels so maybe it's not a big deal and weedys pic proves that different wood on stairs doesn't look bad. If i We're you i Would put your wood of choice on the stairs and upstairs. Maybe someday down the road you'll rip out the main level and match it...

Have you looked at the stone patterned engineered tile, like Alterna (made by Armstrong), Supreme Elite, IVC or MetroFlor ? I do think they can look very good against natural wood -- because they have more substance and a different finish, they look much better than any sheet vinyl and many planks, also are warmer and more comfortable than tile. There are several other brands. I have a (now discontinued) Metroflor product that I think looks really nice next to my old red oak floors. You do have to be sure that the tones are compatible with your wood. I have seen some wood grain vinyl planks that are really lovely and durable, but to my eye they just never look right next to real wood -- especially an older wood floor. Have you considered cork?

Stairs should match the floors. Period. You need new bamboo treads.