You can't add wood to the floor when the walls and ceiling is covered in wood. If you want wood or a wood look on the floor then remove the wood from the walls. The ceiling can stay as is. The diagonal wood on the wall is so 1970s anyway. It's time it was removed.

I would select a darker version of what's on the ceiling. Your posted selection is too cool in tone. The sample boards you have on the floor are a much better selection.

Also, as long as your fixing things in the room, go over that horrible brick wall with large black tile.

That's a tricky transition since you have real wood walls and trim in the sunroom. Is that actual wood or laminate that runs up to sunroom?

The room should have real wood, but it will need to be engineered wood since it's built on a slab. Suggestions: get variieted wood slats stained to match the walls but with some darker slats and knotholes to echo your gray floors. This is going to be a conscious mismatch, but the wood in the room should be "the boss," not the floor next to it.

Contemporary Feel, Classic Style on the NH Seacoast · More Info

Something varieted like this but with even darker slats and knots veering gray.

Other possibility is to tile the sunroom in pattern that harmonizes with orange wood and the tray

Historic Chapel Hill Home Kitchen Remodel · More Info

Or: As a transition between rooms, lay down patterned indoor outdoor area rug that has some gray in addition to warm golds. and coordinates with your furnishings. (Will this gray floor trend ever be over? It rules out so many great wood furnishings, adjacent flooring, and more!)

Hermosa Indoor and Outdoor Floral Tribal Ikat Ivory/Multi Rug, 5'3"x7'6" · More Info

If that is not perfectly climate controlled, you will have issues with anything but tile.

I really like @Lyn Nielson advice! I have the same walls in our sunroom-- slanted and everything. This room was part of a huge add-on from 1984 on our hobby farm which we bought 1 year ago. The ceiling is white dry wall. At first, I wanted to paint the walls and debated even painting the wood floor with porch paint, but the rustic feel of the wood walls goes so well with the beautiful views outside. We may just refinish or paint the floors at some point. It does not look bad with wood floors, which are a similar color, but the stain is very worn off, so we have area rugs to help protect it.

I like your color choice in the first picture, but the second picture of your existing grey/brown flooring seems like it'll be abrupt looking when they meet at the doorway. I would suggest going with the heated tile idea.

Varieted pattern wood

Sunriver Family Lodge · More Info

Winter Cabin · More Info