1. Same as walls

The papered walls look so pretty with the white trim and the black door; consider doing outside what you did inside...black doors and white trim especially if you are keeping the knotty pine ceiling....also you do have a trim piece to bridge the walls and ceiling?

The inspiration photo has no trim, so if you do the trim white like the walls you may get the effect desired. What about the door color but paled-out by mixing with white 75%, if you want more green? Or a pale greyed-out lavender, the greyed-out lavender being a complement to the green?

Paint the trim the same as the walls.

I have SW Neutral Ground walls painted in a Matte sheen, with Trim painted in Satin. I love it--so pretty, and easy to work with. Or do Eggshell sheen on walls, and Semi-gloss for trim. That is all just preference. Either way, the overall look is lovely.

Since this is essentially a mudroom that sees a lot of dirt the walls are satin, but I could get a semi-gloss for the trim. The vote seems to be the same as the walls, and when I went back through my ideabooks that seems to be what most of my pics have. I am not trying to copy the look just the feel, so here are a few more that I like.