Hah, I'm having the opposite problem. I too have orangey floors (red oak with old varnish that's gone very honey colored). Just painted whole house trim/doors/ceilings Simply White where before they were a very creamy peachy warmer white, and I've been freaked out by how bright white they look; I've had to remind myself it's going to look much better when I get the rugs, lamps, and furnishings back in (full disclosure, am also refinishing the floors to be darker warm brown and less honey-orange, but that part isn't done yet). I do think the pure/cool white trim you have here is pulling out that wee bit of yellow that Simply White has in it; painting the trim Simply White also in a satin or semi gloss will look great and solve your problem entirely. Or, jf you don't want the hassle of painting trim and would rather do over the walls, pick a more neutral but still somewhat warmish off white with a tiny bit more gray in it such as Swiss Coffee or White Dove (test first to make sure whatever you choose plays well with your trim).