Pictures needed. And of equal importance, a clearly articulated question.

Yes, photos are needed and a more detailed description on what advice you're needing will help with providing the assistance you're looking for.

I use blues and greens and a form of gold as my primary pallette. Sometimes the gold is more yellow, sometimes more brown. I have a range of medium tone wood and my trim is SW alabaster in all rooms and the warmth works well. Fall is a great time of year to check out this pallette as it is used a lot at target and hobby lobby, but works all year. Hope this helps!

I like blue and green with white.

Yes! Look outside your window. Nature is replete with all colors. Just pick a third color for your 10% ish complementary color from a rug, curtains, wallpaper, etc. that you like. See examples like wallpaper and fabrics from William Morris's art: https://wmgallery.org.uk/

See also, wallpaper examples of the strawberry thief: https://www.janeclayton.com/morris-co-strawberry-thief-wallpaper-indigo-mineral-212564-us/

Or see examples as found in pillows at Rejuvenation: https://www.rejuvenation.com/shop/decor/all-pillows-throws/

I would add a warm aged-gold or soft brass accent. It would bring warmth to the blue and green without competing with either color, and it could be introduced gradually through lighting and just a few carefully chosen decorative pieces. I would avoid adding it everywhere—two or three noticeable accents would be enough to make the room feel more layered and polished.

I recently made a video about five timeless pieces inspired by beautiful historic interiors, and it shows how classic details can work surprisingly well in modern rooms. It might give you some ideas for introducing that warmer third accent without changing your existing color scheme. Links to all the featured pieces are in the video description: https://youtu.be/PoZYuVMbVXQ